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IS-IS over IP No 224.0.0.22 Internet Group Management Protocol (IGMP) version 3 [22]: §4.2.14 No 224.0.0.102 Hot Standby Router Protocol version 2 (HSRPv2) / Gateway Load Balancing Protocol (GLBP) No 224.0.0.107 Precision Time Protocol (PTP) version 2 peer delay measurement messaging No 224.0.0.251 Multicast DNS (mDNS) address No 224.0.0.252
Multicast DNS (mDNS) is a computer networking protocol that resolves hostnames to IP addresses within small networks that do not include a local name server.It is a zero-configuration service, using essentially the same programming interfaces, packet formats and operating semantics as unicast Domain Name System (DNS).
IP multicast is a method of sending Internet Protocol (IP) datagrams to a group of interested receivers in a single transmission. It is the IP-specific form of multicast and is used for streaming media and other network applications. It uses specially reserved multicast address blocks in IPv4 and IPv6.
mcast.net is a second level domain reserved by the Internet Assigned Numbers Authority (IANA) and maintained by Verisign used to bind DNS records unique to multicast addressing. [1]
The domain name .local is a special-use domain name reserved by the Internet Engineering Task Force (IETF) so that it may not be installed as a top-level domain in the Domain Name System (DNS) of the Internet. As such it is similar to the other special domain names, such as .localhost. [1]