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 and its subdomains are not associated with any web site.
In 2011 it was proposed to make it flow into the domain .arpa without having found success.[2]
Examples of multicast address definitions in the domain mcast.net are:
| Domain name | Address | Description | |
|---|---|---|---|
| base-address.mcast.net | 224.0.0.0 | base address | |
| all-systems.mcast.net | 224.0.0.1 | all systems on the local networks | |
| all-routers.mcast.net | 224.0.0.2 | all routers in the local networks | |
| dvmrp.mcast.net | 224.0.0.4 | all routers for the Distance Vector Multicast Routing Protocol (DVMRP) | |
| igmp.mcast.net | 224.0.0.22 | IGMP protocol | |
| mdns.mcast.net | 224.0.0.251 | Multicast DNS protocol | |
| ntp.mcast.net | 224.0.1.1 | Network Time Protocol (NTP) | |
| sip.mcast.net | 224.0.1.75 | Session Initiation Protocol (SIP) servers |