Class D multicast address range — used for one-to-many delivery protocols like mDNS, OSPF, SSDP, and streaming media. Source addresses are always unicast; these appear only as destinations.
This range is reserved by IANA — it is not allocated to an organization, ISP, or regional internet registry. Addresses here appear on every private/internal network that follows the standard, so lookups will not identify a specific owner. 225.55.0.0/16 is a sub-block of 224.0.0.0/4, the defining reserved range.
First and last addresses in 225.55.0.0/16
225.55.0.0/16 runs from 225.55.0.0 to 225.55.255.255.
Frequently Asked Questions
What is 225.55.0.0/16?
225.55.0.0/16 falls inside 224.0.0.0/4 — a Multicast range reserved by RFC 5771. Class D multicast address range — used for one-to-many delivery protocols like mDNS, OSPF, SSDP, and streaming media. Source addresses are always unicast; these appear only as destinations.
Is 225.55.0.0/16 routable on the public internet?
No. 225.55.0.0/16 is part of IANA-reserved special-use space (224.0.0.0/4, RFC 5771). Packets with these addresses are either filtered by backbone routers or handled as local/special traffic — they never reach the public internet.
Who owns 225.55.0.0/16?
225.55.0.0/16 is not allocated to any organization or ISP. It is part of the Multicast block reserved by IANA under RFC 5771 for every network to use privately.
