IPv4 Experts in Germany
matched with precision in minutesHire experts who plan address schemes, troubleshoot routing and NAT, and maintain reliable enterprise networks across cloud, data centre and industrial environments. FRATCH connects you quickly with vetted, available freelancers whose IPv4 skills match your project.
Meet FRATCH Experts in Germany, who have recently used IPv4
Jens R.
Last position:
Platform Architect & Senior Developer at Direct client, industrial measurement technology, medium-sized company
- Technical leadership across hardware, firmware, and software teams; scope: hardware/firmware team (4 people) and leadership group (5 people)
- Consolidated and documented a product family that had grown over more than 15 years and aligned it with CRA compliance — from the bare-metal I/O module to the cloud interface.
- Provided the most important customer product with the essential requirements and architecture documentation within two months — for a firmware landscape that had grown over more than 15 years. It now supports the customer’s modernization strategy.
- Established a monthly reporting line to the supervisory board and executive board within three months: nine meetings since 12/2025. The report itself is versioned and built from the CI pipeline; it is based on automatically collected activity and release data instead of assessments.
- Built a container-based CI/CD infrastructure from scratch: cross-compilation, host tests, and documentation builds in one continuous pipeline.
- Introduced declarative QA gates for DevOps and development artifacts — from the start using lefthook instead of pre-commit, executed in a dedicated container image.
Technologies used: arc42, req42, tpo42, docToolchain, PlantUML, ArchiMate, C4 model, ADR, C, C++ (GTest), CMake, Bare Metal (ARM Cortex-M3/M7), OCI containers, Jenkins, lefthook, Prometheus, Grafana, SBOM, CRA, OPC, SCADA, PLC integration, IPv6 migration, Zero Trust, Sociocracy 3.0, Cynefin
Matthias S.
Last position:
Software Developer and Consultant at CLADE GmbH
- Analysis of the existing CAN communication between microcontrollers
- Analysis of the sensors used and the measured values collected
- Planning the CAN messages for transmitting the measured values
- Iterative adjustment of the microcontroller code to the new CAN messages
- Cross-compilation from x64 to arm64
Marcus B.
Last position:
Java and Quarkus Expert at Large German energy service provider
- Modernization of a large-scale Java enterprise application*
The project is modernizing a complex enterprise application that has grown over many years. The existing Spring-based legacy system runs on Java 8, OSGi, and Eclipse RCP and is being gradually migrated to a modern, maintainable architecture with Java 25 and Quarkus.
Marcus works on analysis, architecture, refactoring, and implementation. One focus is on untangling historically grown structures and dependencies and on building a clean, sustainable Java and Quarkus technology stack.
Tools & technologies: Java 8, Java 25, Quarkus, Hibernate ORM with Panache, EclipseLink, OSGi, Eclipse RCP, Maven, JUnit, Mockito, REST, JSON, Git, Eclipse IDE, IntelliJ IDEA Ultimate, Jira, Confluence
Markus B.
Last position:
Consultant, Technical Project Manager at Lanxess
- Project: ESU Windows and SQL Server consolidation / Configuration Management in ServiceNow
- Creation of an as-is analysis of all servers worldwide
- Creation of an as-is analysis of all SQL servers worldwide
- Creation of requirements analyses for SQL and server migrations
- Coordination of requirements with partners for migrations to Hyper-V (on-premises) or Azure Cloud
- Moderation of jour fixe meetings
- Creation of roadmaps and solution models for server migrations
- Setup of test scenarios
- Moderation of workshops for the introduction of a Global Admin Team
- Creation of data models (CMDB) in ServiceNow
- Conducting workshops for the CMDB data model
- Creation of solution models for the CMDB
- Creation of seamless configuration and work documentation for the CMDB
- Creation of reports for license management
- Creation of KPIs for data quality in ServiceNow
- Creation of a service catalog
- Moderation of workshops for creating service requests
- Interface between needs analysis and ServiceNow development team
- Systems used: Windows 7, Windows 10, Microsoft Office 365/2010, Windows Server 20xx, SQL Server 20xx, SharePoint, Azure Cloud, Hyper-V, ServiceNow, various tools
Ljubomir O.
Last position:
Senior Software Test Engineer at Keil KTM GmbH
Temporary employment
- System black-box integration tests (BBIT, IVVQ): Execution of regression, release, acceptance, and compliance tests for safety-critical brake control units in the rail industry
- Software test application & integration: Runtime configuration of software components and libraries, validation of interfaces, configuration dependencies, and component interactions
- Test automation (FEAT framework): Co-development and further development of an automated test framework for test execution, reporting, and result analysis
- Functional safety (SiL4, FuSi): Ensuring compliance with safety requirements, traceability and coverage, as well as standards compliance according to EN50126/28/29
- Test automation for communication components: Configuration and validation of fieldbus (CAN) and Ethernet-based TCMS data communication interfaces (TRDP and CIP)
- Requirements analysis & shift-left (PTC Windchill ALM): Analysis of software and system artifacts to identify gaps, ambiguities, and redundancies early in the SDLC
- Test design & test case development: Derivation of test conditions, coverage strategies, and implementation of data-driven test cases (DDT), including reusable test data fixtures
- CI/CD & automation (Python, PowerShell, Jenkins, SVN): Automation of build, test, and HIL deployment processes as well as integration into CI/CD pipelines
- Test data & configuration management (XML): Maintenance and adaptation of XML test vectors and system configurations with automated integration into test environments
- Non-functional testing: Execution of performance and load tests to assess stability and system behavior
- Agile development & defect management (JIRA, Confluence): Participation in Scrum teams, test coordination, review of test artifacts, as well as defect tracking and root-cause analysis
- Error analysis & debugging (CANoe, CANalyzer): Analysis of errors and message flows across multiple system layers (application to bus)
- Model-based analysis (UML, Enterprise Architect): Specification of SUT/SOW and support for systematic test control
- Process & test documentation: Creation of integration and test documentation according to internal quality and certification requirements
Christian E.
Last position:
IT Consulting / IT Rebuild at IT-Neuaufbau (PF)
- Analysis of requirements and the current situation
- Migration of an old domain structure and Tobit to Exchange 2019 with integration to MS365
- Evaluation of implementation paths and planning for securing sensitive data
- Planning regarding BSI basic protection, the German Federal Data Protection Act (BDSG), and GDPR
- IT governance and IT security backtests
- Support with ERP setup and securing mail transfer
- Hyper-V 2016/2022, Microsoft Terminal Services Cluster, Microsoft Exchange 2019
- Office 365, Microsoft 365, Azure AD, Teams, Salesforce
- Cisco, Zyxel, and HP switches, Sophos firewalls/UTMs, SecurePoint
- Microsoft IIS 2022, IPv4/IPv6, Veeam, Wortmann online backup, NextCloud
- Services: DNS, DHCP, TCP/IP, subnetting, firewalling, routing, VoIP, Group Policy (GPO), SIEM, remote work, home office, high availability, failover, VLAN, PRTG
Florian K.
Last position:
LAN Planner at Global Network AG
- As-is assessment of the current network infrastructure and its documentation, including on-site inspections
- Independent planning of new distribution and main distribution rooms in the individual district offices (components used, rack layout, connectivity), considering the BSI IT-Grundschutz and InfoSic requirements
- Planning of new copper and fiber optic cabling, including patch panels
- Coordination with building services engineering (TGA) to ensure compliance with relevant on-site requirements
- Development of detailed execution plans and high-level concepts for the rollout of the new infrastructure
- Additional support after the components go live (hypercare phase)
- Regular communication with project management and client stakeholders
Pierre G.
Last position:
Ansible Automation, Windows Third Level Support at DB InfraGO AG
- PRISMA project
- Ansible automation
- Windows third-level support for Windows NT, Windows 2000, Windows 2013, Windows 2016, Windows 2019
Ulf H.
Last position:
Configuration Manager (Interim) at In-house Development
- Requirements analysis and replacement of local SharePoint as CMDB with open source NetBox to prepare for deploying Cisco ACI (SD-WAN) with Microsoft Azure
- Coordination with systems like Checkmk and Grasp
- Introduction and coordination of cmdbsyncer as CMDB data hub; further development of the syncer with Kuhn & Ruess GmbH
- Implementation of SNMPv3 on AIX LPAR/VIO, Linux, Windows, SAN/storage, network components (Cisco switches, F5 load balancers, Palo Alto and CheckPoint firewalls, iLO boards)
- Deployment and further development of the network scanner JDisc in cooperation with the vendor (Utimaco HSMs, Linux detection)
- Integration of NetBox, JDisc, and cmdbsyncer into the infrastructure using Docker containers
- End-user training: preparation, creation of materials, and delivery
- Creation of data flow and network diagrams
- Population and planning of IPv4/IPv6 with NetBox including VLAN import
- Dual-stack setup of servers and clients with IPv4 and IPv6
- Connection of REST interfaces for Checkmk, JDisc, vSphere, HMC, i-doit, NetBox Software: Confluence, Jira, MS Office 365, Teams, i-doit, NetBox, JDisc, cmdbsyncer, DB Visualizer, vSphere, HMC
Nicole F.
Last position:
SAP FI Consultant & Test at DZB Bank
- Analysis and optimization of business processes in financial accounting
- Customizing in SAP FI (e.g. company codes, chart of accounts, payments)
- Integration with other modules such as CO, MM, SD
- Consulting on legal requirements (e.g. GoBD, UStG)
- Support with month-end and year-end closing
- Creation of test plans (system test, integration test, UAT)
- Definition of test cases (e.g. postings, payment runs, dunning runs)
- Selection of suitable test data and scenarios
- Manual testing of posting processes (e.g. customer invoice, payment run)
- Validation of automatic postings (e.g. for MM credit memo)
- Checking interfaces (e.g. to subsystems or non-SAP solutions)
- Documentation of defects in the test tool (e.g. Jira, ALM)
- Analysis and feedback to developers or the customizing team
- Retest after bug fixes
- E2E tests with SAP Solution Manager (SOLMAN)
- Use of tools such as SAP CBTA or Micro Focus UFT
Minh Duc V.
Last position:
Senior System Engineer Network & Security at F.S. Fehrer GmbH & Co. KG
- Responsible for the configuration, maintenance, monitoring, troubleshooting, and optimization of the IT infrastructure, including Extreme Networks, SD-WAN, and Fortinet security solutions, at all international company locations in Europe and North America
- Development of a comprehensive strategic roadmap to optimize the network architecture, including VLANS, NAC, QoS, firewall configurations, VPNs, DPI, NGFW, threat intelligence, and SSL/TLS inspection
- Implementation of the OneIT strategy through the introduction of new technologies such as Cisco DNA Center, ExtremeCloud IQ, FortiOS, FortiManager, and FortiAnalyzer, which increased employee skills and the efficiency of the IT systems
- Integration of IT and OT systems to optimize the network and security architecture and improve operational efficiency
Eugen B.
Last position:
Test Manager at Research Industrial Systems Engineering (RISE) Forschungs-, Entwicklungs- und Großprojektberatung GmbH
- Creation of test concepts
- Requirements management
- Release planning and support
- DDS management
- Reporting (test report, AFO TestMatrix)
- UAT/BAT coordination
- Onboarding of new team members
- Team planning / capacity planning
- Support with documentation
- Methods/tools/technologies: black box, white box, exploratory testing, E2E testing, regression testing, L&P testing, acceptance testing and interface testing, integration and system testing, networking, JIRA with Zephyrscale plug-in, Confluence, RISE Portal, Ethernet, IPv4, IPv6, Linux, VM, Postman, SQL, SQL-Developer, Bruno, Wireshark, cloud, Burp Suite, Notepad++
Konstantinos M.
Last position:
IT-Fly Specialist – Global Rollout at Lufthansa Group
Plan & Prepare (Site Design & Readiness): Inventory & Design: Dell PowerEdge R-Series, Aruba switches (L2/L3), notebooks/peripherals; serials/asset tags, IPv4/IPv6 addressing, VLAN-/DHCP-/DNS plan
Runbooks/MOPs: site rollout runbook, backout strategy (<15–30 min), risk register, communication matrix; approvals via CAB/change
Images/Packages: Golden Image (Win10/11), driver packs, BIOS/UEFI baseline; O365/Teams/OneDrive KFM; BitLocker policies; MECM/SCCM, Intune/Autopilot, MDT/WinPE
Logistics: shipping/customs clearance, RMA/DOA, on-site spares; tools (barcode scanner, label printer), "Go-Bag" (cables, SFPs, console cables)
Deliver (on-site implementation): End devices: swap & migration (USMT/OneDrive KFM), peripherals (ATB/BT printers, scanners, boarding gate hardware); domain join, compliance checks, O365 activation, printers/queues, network drives
Acceptance: functional tests for DCS/CUTE/CUPPS/CUSS stations, ticketing/check-in workflows, boarding gates
Server (R-Series): rack & stack, cabling (PDU redundancy, fiber/copper), labeling/naming; firmware/RAID (PERC), Lifecycle Controller, iDRAC network; Windows Server 2022/2025 + CIS/BSI hardening; agents (backup/AV/EDR/monitoring), time service/NTP auth, Syslog/SNMPv3
Network (Aruba): VLANs, LACP trunks, MSTP root; PortFast + BPDU Guard at the edge; QoS (EF/AF); dual stack (v4/v6), DHCP relay. NAC/802.1X with ClearPass/Radius/TACACS+, roles + MAB fallback; guest isolation, ACLs (Guest→Mgmt deny). Telemetry: sFlow, SNMPv3, Syslog→SIEM; LLDP→inventory/CMDB
Airport specifics: CUTE/CUPPS/CUSS terminals; DCS/Amadeus/SITA connectivity; FIDS (read-only); bag tag/boarding pass printing; changes in off-peak/night windows
Stabilize (hypercare): first-day support, KPI tracking (login times, ticket volume, error classes), QoS fine-tuning
Troubleshooting: Wireshark/iperf, event logs, switch counters, sFlow flows; fast incident handling as SPOC
Knowledge transfer: short training sessions for station teams, mini-runbooks (fault/recovery)
Close (documentation & handover): docs & CMDB: final configs (switch/server), topology/patch plans, IP tables, serial/asset lists, before/after photos
Acceptance & sign-off: UAT protocols, functional evidence (use cases), return/reuse of old hardware
Lessons learned: risks, standard packages, driver freeze, "known issues"
Interfaces/communication: station IT, airport IT, SOC/NOC, ground ops/ramp/check-in, provider (SITA/Amadeus). ITSM: ServiceNow (Inc/Req/Change/KB), handover to BAU
Tom H.
Last position:
Network Architect / System Engineer at Teleperformance
Professional focus: Fortinet rollout / site standardization / cloud / ISP migration
- Network analysis, design and optimization, change
- ISP changes
- Commissioning of service providers and decentralized IT support teams
- Setting up a central management platform
- Routing optimization for dynamic routing
- Optimizing and creating firewall rules
- AWS connection / design
- MS Azure connection / design
Technologies / tools: Fortigate, Palo Alto, WAN, SDN WAN, VPN, BGP, OSFP, Fortimanager, Panorama, Meraki, Alcatel, AWS, MS Azure, Network Architecture
Andreas W.
Last position:
Freelancer at Infrafibre Networks GmbH
- Assessing the current status (planning stage / rollout status) of the so-called inter-polygon routes
- Creating an end-to-end project plan for the individual routes, considering active and passive components and tasks
- Monitoring and controlling the implementation of the plan
- Optimizing the chosen network architecture
- Creating network and splice diagrams
Discover over 15,000 top freelancers
Statistics of experts using IPv4
Aggregated from the professional profiles of matched freelancers.
Experience
20 years
Position duration
2 years
Positions per freelancer
17
Top business areas
Information Technology, Project Management, Operations
Top industries
Information Technology, Manufacturing, Telecommunication
Certification focus areas
Information Technology, Quality Assurance, Project Management
Bachelor's degree or higher
71%
Master's degree or higher
53%
Doctorate
6%
Certifications per freelancer
5
Most common languages
German, English, Spanish
Speak two or more languages
96%
Based on our profile pool as of 19 Sep 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Germany are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows how many freelancers charge within that range.
Average rates of experts in Germany using IPv4
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 19 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
IPv4 experts industry focus
See which industries our matched freelancers work in most often — every figure is calculated live from the freelancers on FRATCH.
- Information Technology (96%)
- Manufacturing (68%)
- Telecommunication (56%)
- Healthcare (48%)
- Automotive (44%)
- Banking and Finance (44%)
- Insurance (36%)
- Government and Administration (36%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Addressing and routing
IPv4 is the Internet Protocol used to identify devices and move packets across local networks and the public internet. Companies rely on it for office connectivity, data centres, hosted services, industrial systems and applications that still depend on established address space. Specialists design logical address plans, routing paths and segmentation that keep traffic predictable.
Network foundations
IPv4 work spans switches, routers, firewalls, VPN gateways, load balancers and wireless infrastructure. Professionals configure static routes, dynamic routing, DHCP, DNS integration, NAT and access controls. They also trace packet paths and interpret logs, interface data and flow records to isolate faults without disrupting dependent services.
Typical assignments
- Create subnetting and address-allocation plans for new sites or environments
- Resolve duplicate addresses, exhausted pools, routing loops and unreachable hosts
- Connect on-premises networks with cloud and data-centre infrastructure
- Replace fragile manual configuration with documented DHCP and IPAM processes
- Prepare coexistence strategies for IPv4 and IPv6 networks
When expertise matters
Companies usually bring in freelance IPv4 specialists during migrations, acquisitions, site openings, security reviews or major infrastructure changes. They are also valuable when recurring outages, slow troubleshooting or undocumented address ranges expose weaknesses in an existing network. In Germany, projects may involve distributed offices, manufacturing sites, logistics operations or regulated business environments where careful planning and clear documentation matter.
Tools and adjacent skills
Strong professionals work comfortably with IP address management systems, packet analysers, network monitoring, configuration repositories and infrastructure automation. Their broader skills often include IPv6, Ethernet, VLANs, BGP, OSPF, firewall policy, VPN technologies, Linux or Windows networking and cloud connectivity. They understand how DNS, DHCP and NAT affect application behaviour rather than treating addressing as an isolated task.
Quality signals
Look for experts who can explain an address plan in plain language, show how they validate changes and distinguish a routing fault from a DNS or firewall issue. Useful deliverables include current diagrams, subnet inventories, configuration backups, test procedures and handover notes. For remote collaboration, precise access controls, shared documentation and an agreed change window are essential; on-site work can help when physical cabling or equipment is part of the problem.
Frequently asked questions
Everything clients usually want to know about IPv4, in one place.
IPv4 connects devices, services and network segments across offices, data centres, cloud environments and industrial sites. It supports routing, remote access, application delivery and communication between systems that may be local or internet-facing.
IPv4 remains widely supported and often fits established infrastructure, while IPv6 provides a much larger address space and modern capabilities. The right choice depends on existing equipment, application compatibility, provider support and whether the company needs a managed transition or dual-stack operation.
A strong IPv4 specialist should understand subnetting, routing, DNS, DHCP, NAT, VLANs, firewalls and VPNs. Experience with IPv6, cloud networking, monitoring and IP address management is also valuable for mixed environments.
The required depth depends on the scope. A small address cleanup may need focused troubleshooting, while a site migration or data-centre redesign calls for an IPv4 professional who can model dependencies, plan changes, test routes and document the resulting environment.
Many IPv4 tasks can be completed remotely through secure access, monitoring data and shared network documentation. On-site collaboration in Germany becomes more useful when physical equipment, cabling, access restrictions or local coordination must be assessed directly.
Ask the professional to explain a real addressing or routing problem, the evidence they used and how they avoided service interruption. For IPv4 work, quality is reflected in clear diagrams, tested changes, accurate inventories and practical handover documentation.
A typical IPv4 engagement can produce an address plan, subnet inventory, routing overview, firewall and NAT dependencies, change runbooks and validation results. The exact set should reflect the systems affected and the operational team that will maintain them.
Before starting, an IPv4 professional should clarify the network scope, existing diagrams, address ownership, routing protocols, security controls, cloud connections and change process. It is also important to agree on remote access, on-site expectations, documentation standards and communication language.
The average hourly rate of freelancers in Germany who have used IPv4 in their recent projects is 105 €, which corresponds to a daily rate of about 841 € based on an 8-hour working day.
Of the freelancers in Germany who have used IPv4 in their recent projects, 71% hold at least a Bachelor's degree, 53% hold at least a Master's degree, and 6% hold a doctorate.
On average, freelancers in Germany who have used IPv4 in their recent projects have 20 years of professional experience, with a single engagement typically lasting around 2 years.
The most common languages among freelancers in Germany who have used IPv4 in their recent projects are German (100%), English (96%), and Spanish (12%).
The most common industries among freelancers in Germany who have used IPv4 in their recent projects are Information Technology (96%), Manufacturing (68%), and Telecommunication (56%).
The most common business areas among freelancers in Germany who have used IPv4 in their recent projects are Information Technology (100%), Project Management (72%), and Operations (64%).
Main locations of FRATCH Experts, who have recently used IPv4
Our freelancers and interim experts are at home across the DACH region — available on-site in the major business hubs or fully remote. Choose a location to discover matched specialists, local market insights and up-to-date availability.
Berlin Hamburg Munich Cologne Frankfurt Stuttgart Dusseldorf Leipzig Dortmund Essen Bremen Dresden Hanover Nuremberg Request a free demo
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Philipp Thomaschewski
FRATCH CEO
