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Large Block Assignments as per RFC 5771 |
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| Address Range | Size | Designation | General Description |
| 224.0.0.0 – 224.0.0.255 | (/24) | Local Network Control Block | Protocol control traffic that is not forwarded off link (local network only.) |
| 224.0.1.0 – 224.0.1.255 | (/24) | Internetwork Control Block | Used for protocol control traffic that MAY be forwarded through the Internet such as NTP. |
| 224.0.2.0 – 224.0.255.255 | 65024 | AD-HOC Block I | Assigned by IANA for needs that don’t fit in the first two categories. These addresses MAY be routed through the Internet. |
| 224.1.0.0 – 224.1.255.255 | (/16) | Reserved | |
| 224.2.0.0 – 224.2.255.255 | (/16) | SDP/ SAP Block | Used for SDP (Session Description Protocol) and SAP (Session Announcement Protocol) only. |
| 224.3.0.0 – 224.4.255.255 | (2 /16s) | AD-HOC Block II | Assigned by IANA for needs that don’t fit in the first two categories. These addresses MAY be routed through the Internet. |
| 224.5.0.0 – 224.255.255.255 | (251 /16s) | Reserved | |
| 225.0.0.0 – 231.255.255.255 | (7 /8s) | Reserved | |
| 232.0.0.0 – 232.255.255.255 | (/8) | Source-Specific Multicast Block | SSM [RFC4607] is an extension of IP Multicast in which traffic is forwarded to receivers from only those multicast sources for which the receivers have explicitly expressed interest and is primarily targeted at one-to-many (broadcast) applications. |
| 233.0.0.0 – 233.251.255.255 | 16515072 | GLOP Block | Addresses in the GLOP Block are globally-scoped, statically-assigned addresses. The assignment is made, for a domain with a 16-bit Autonomous System Number (ASN), by mapping a domain’s autonomous system number, expressed in octets as X.Y, into the middle two octets of the GLOP Block, yielding an assignment of 233.X.Y.0/24. The mapping and assignment is defined in [RFC3180]. Domains with a 32-bit ASN MAY apply for space in AD-HOC Block III, or consider using IPv6 multicast addresses. |
| 233.252.0.0 – 233.255.255.255 | (/14) | AD-HOC Block III | Assigned by IANA for needs that don’t fit in the first two categories. These addresses MAY be routed through the Internet. |
| 234.0.0.0 – 238.255.255.255 | (5 /8s) | Reserved | |
| 239.0.0.0 – 239.255.255.255 | (/8) | Administratively Scoped Block | Addresses in the Administratively Scoped Block are for local use within a domain and are described in [RFC2365]. |
