Website: nip.io
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nip.io is a wildcard DNS service that allows you to map any IP address to a hostname. It simplifies the process of testing and developing applications that rely on specific IP addresses. The service is open source and licensed under Apache 2.0, with its code available on GitHub. It's provided by Exentrique Solutions, the same organization behind XP-Dev.com, a platform for hosting Git, Mercurial, and Subversion repositories. The service is free to use, and feedback or contributions are welcome through GitHub. How nip.io Works: nip.io uses a simple format to map IP addresses to hostnames. It supports both named and unnamed mappings, and it's especially useful for scenarios where you need to test applications that rely on specific IP addresses. The service is powered by PowerDNS with a custom pipe backend written in Python. Examples of Usage: Without a Name: 10.0.0.1.nip.io maps to 10.0.0.1 192-168-1-250.nip.io maps to 192.168.1.250 0a000803.nip.io maps to 10.0.8.3 With a Name: app.10.8.0.1.nip.io maps to 10.8.0.1 app-116-203-255-68.nip.io maps to 116.203.255.68 app-c0a801fc.nip.io maps to 192.168.1.252 customer1.app.10.0.0.1.nip.io maps to 10.0.0.1 customer2-app-127-0-0-1.nip.io maps to 127.0.0.1 customer3-app-7f000101.nip.io maps to 127.0.1.1 The service also supports dot, dash, and hexadecimal notations for IP addresses, which can be useful in various scenarios. Troubleshooting: It's important to note that some DNS resolvers, forwarders, and routers have DNS rebinding protection, which may cause issues with resolving local and private IP addresses. In such cases, nip.io may not work as expected. Related Services: The website mentions related services, such as localtls, sslip.io, and local.gd, which offer similar functionality with some variations. Overall, nip.io is a useful tool for developers and testers who need a simple and flexible way to map IP addresses to hostnames for their applications."