One address or block a day, with the story behind it and where the fact comes from. This is the entry for 19 October 2026; the latest entry is on the main page.
19 October 2026 · permalink
TEST-NET-2 (RFC 5737), one of the three documentation blocks. Together with 192.0.2.0/24 and 203.0.113.0/24 it exists so examples, sample configs and this site's own test fixtures can use realistic addresses without touching anyone's real network.
Source: IANA IPv4 Special-Purpose Address Registry (RFC 5737)
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