224.0.0.0/4 (Multicast (Class D))
ReservedRFC 5771
224.0.0.0/4 at a glance
| CIDR block | 224.0.0.0/4 |
|---|---|
| First address | 224.0.0.0 |
| Last address | 239.255.255.255 |
| Total addresses | 268,435,456 |
| Subnet mask | 240.0.0.0 |
| Prefix length | /4 |
| Type | Reserved |
| Publicly routable | No |
| Defined in | RFC 5771 |
Open in CIDR calculator/4 subnet details
What is 224.0.0.0/4 used for?
224.0.0.0/4 is the IPv4 multicast range, the former Class D, covering 224.0.0.0 to 239.255.255.255. Packets sent to one of these addresses reach every host that joined the group. 224.0.0.0/24 is link-local control traffic (OSPF uses 224.0.0.5 and 224.0.0.6) and 239.0.0.0/8 is for private, organization-scoped use.
Common subnets of 224.0.0.0/4
FAQ
What is the multicast address range?
224.0.0.0 to 239.255.255.255 (224.0.0.0/4) for IPv4, and ff00::/8 for IPv6.
What are 224.0.0.5 and 224.0.0.6 used for?
OSPF. 224.0.0.5 reaches all OSPF routers and 224.0.0.6 reaches the designated routers (DR and BDR). Other well-known ones are 224.0.0.9 (RIPv2) and 224.0.0.10 (EIGRP).
What is 239.0.0.0/8?
Administratively scoped multicast (RFC 2365), the multicast equivalent of a private range for use inside an organization.