One address or block a day, with the story behind it and where the fact comes from. This is the entry for 20 October 2026; the latest entry is on the main page.
20 October 2026 · permalink
TEST-NET-3 (RFC 5737). Documentation's third reserved block, and the one that catches people out because it looks like a perfectly ordinary public address.
Source: IANA IPv4 Special-Purpose Address Registry (RFC 5737)
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