One address or block a day, with the story behind it and where the fact comes from. This is the entry for 22 October 2026; the latest entry is on the main page.
22 October 2026 · permalink
Limited broadcast (RFC 919): a datagram sent here is delivered to every host on the local link and goes no further. Routers do not forward it, which is why it can be sent without knowing anything about the network.
Source: IANA IPv4 Special-Purpose Address Registry (RFC 919, Section 7; RFC 8190)
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