In today’s networked world, managing IP addresses efficiently is crucial. Network engineers are increasingly turning to open-source IP Address Management (IPAM) tools to streamline their operations. These solutions offer flexibility, cost-effectiveness, and adaptability. Here are five leading open-source IPAM applications, along with their key pros and cons. ### 1. **phpIPAM**  phpIPAM is one of the most popular IPAM tools in the open-source space, designed with ease of use and scalability in mind. It provides powerful features for managing IPv4 and IPv6 addresses. **Pros:** - Intuitive web-based interface - Supports API integration - VLAN management, subnets, and VRFs - Active directory and LDAP integration **Cons:** - Limited advanced reporting - Lacks robust DHCP server integration ### 2. **NetBox**  Originally developed by DigitalOcean, NetBox is designed as a comprehensive infrastructure resource modeling (IRM) tool, not just IPAM. It manages not only IP addresses but also data center resources. **Pros:** - Highly customizable - Handles device management along with IPs - Extensive API support for automation - Great documentation **Cons:** - Steep learning curve for beginners - More focused on data center environments than enterprise networks ### 3. **GestióIP**  GestióIP is a web-based IPAM solution tailored for small to medium-sized networks. It offers automatic subnet discovery and detailed network visualizations. **Pros:** - Automatic subnet and host discovery - Supports IPv4 and IPv6 management - No database required, as it runs on flat files **Cons:** - Dated user interface - Limited integrations compared to other solutions ### 4. **TeemIP**  TeemIP is an IPAM tool that integrates well with ITIL processes, making it ideal for enterprises that adhere to structured IT service management (ITSM) standards. **Pros:** - Seamless integration with iTop for full IT asset management - IP address history tracking - API support for automation **Cons:** - Can be complex to configure initially - Focused heavily on ITIL, which might not appeal to all users ### 5. **OpenNetAdmin**  OpenNetAdmin provides a simple and effective solution for managing IP space with multiple customizable features like VLAN management and DNS integration. **Pros:** - Highly customizable with a plugin architecture - Built-in DNS and DHCP management - Easy to use interface **Cons:** - Documentation can be lacking for more complex setups - Somewhat limited in handling larger, dynamic environments ### Conclusion: Each of these open-source IPAM applications offers distinct advantages, catering to different networking needs. For simple network management, phpIPAM and GestióIP may suit smaller setups. For more robust, customizable environments, NetBox and OpenNetAdmin offer comprehensive feature sets. Meanwhile, TeemIP’s ITIL alignment makes it perfect for enterprises with structured ITSM processes. Selecting the right IPAM tool depends on the specific requirements of your network and your team's technical expertise.