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1. Sindarina, Edge Case Detective (sindarina@ngmx.com)'s status on Sunday, 25-Jun-2023 00:45:55 JST Sindarina, Edge Case Detective

   Since I keep seeing developers use ‘pretty’ IP addresses like ’1.2.3.4’ in example configurations; a reminder that you MUST NOT use publicly routable addresses that you do not control in your code.

   Instead, use one of the available 'TEST-NET' IPv4 or IPv6 ranges documented in RFC 6890;

   192.0.2.0/24
   198.51.100.0/24
   203.0.113.0/24

   ❌ 1.2.3.4
   ✅ 192.0.2.4

   and for IPv6;

   ✅ 2001:db8::/32

   Pass it on to all of your fellow developers, documentation writers, and so forth.

   Full RFC for special purpose addresses;

   https://datatracker.ietf.org/doc/rfc6890/

   Reserved for documentation, IPv4 and IPv6;

   https://datatracker.ietf.org/doc/rfc5737/
   https://datatracker.ietf.org/doc/rfc3849/

   1/ 🧵