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224.0.0.0/4

224.0.0.0/4 is multicast

Last updated 2 Nov 2026 from the IANA IPv4 Special-Purpose Address Registry

Short answer

224.0.0.0/4 is multicast: one sender, many receivers, rather than a single device.

Block224.0.0.0/4
First – last224.0.0.0 – 239.255.255.255
Size268,435,456 addresses
Name in the registryMulticast
Defined inRFC 5771

What it means

Addresses from 224.0.0.0 to 239.255.255.255 name groups of devices (RFC 5771). Routers, TV streams and device discovery (for example mDNS on 224.0.0.251) use them.

A multicast address never identifies one connection or person.

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Sources

  1. IANA IPv4 Special-Purpose Address Registry (CC0) · checked 2 Nov 2026
  2. RFC 5771