One address or block a day, with the story behind it and where the fact comes from. This is the entry for 21 October 2026; the latest entry is on the main page.
21 October 2026 · permalink
Reserved (RFC 1112): the top sixteenth of the address space, 240.0.0.0 through 255.255.255.255, was left for future use and never handed out. With IPv4 exhausted it is one of the few large pools that was never allocated.
Source: IANA IPv4 Special-Purpose Address Registry (RFC 1112, Section 4)
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