Reserved Address Range | Use | Notes |
224.0.0.0 to 224.0.0.255 | Used for network protocols on local networks. For more information, see RFC 1700. | In this range, packets are not forwarded by the router but remain on the local network. They have a Time to Live (TTL) of 1. These addresses are used for communicating routing information. |
224.0.1.0 to 238.255.255.255 | Global addresses used for multicasting data between organizations and across the Internet. For more information, see RFC 1700. | Some of these addresses are reserved, for example, 224.0.1.1 is used for Network Time Protocol (NTP). |
239.0.0.0 to 239.255.255.255 | Limited scope addresses used for local groups and organizations. For more information, see RFC 2365. | Routers are configured with filters to prevent multicasts to these addresses from leaving the local system. |