3Com Switch 8800 Configuration Guide Chapter 23 IP Multicast Overview
23-5
Table 23-1 Ranges and meanings of Class D addresses
Class D address range Description
224.0.0.0∼224.0.0.255
Reserved multicast addresses
(addresses of permanent groups). All
but 224.0.0.0 can be allocated by routing
protocols.
224.0.1.0∼238.255.255.255
Multicast addresses available for users
(addresses of temporary groups). They
are valid in the entire network.
239.0.0.0∼239.255.255.255
Multicast addresses for local
management. They are valid only in the
specified local range.
Reserved multicast addresses that are commonly used are described in the following
table.
Table 23-2 Reserved multicast address list
Class D address range Description
224.0.0.0 Base Address (Reserved)
224.0.0.1 Addresses of all hosts
224.0.0.2 Addresses of all multicast routers
224.0.0.3 Not for allocation
224.0.0.4 DVMRP routers
224.0.0.5 OSPF routers
224.0.0.6 OSPF DR
224.0.0.7 ST routers
224.0.0.8 ST hosts
224.0.0.9 RIP-2 routers
224.0.0.10 IGRP routers
224.0.0.11 Active agents
224.0.0.12 DHCP server/Relay agent
224.0.0.13 All PIM routers
224.0.0.14 RSVP encapsulation
224.0.0.15 All CBT routers
224.0.0.16 Specified SBM
224.0.0.17 All SBMS
224.0.0.18 VRRP
