Internet Group Management Protocol, Version 3
RFC 9776, “Internet Group Management Protocol, Version 3”, is an Internet Standard document published in March 2025 by B. Haberman. It updates RFC 2236. It obsoletes RFC 3376. The canonical text is published by the RFC Editor.
Abstract
The Internet Group Management Protocol (IGMP) is the protocol used by IPv4 systems to report their IP multicast group memberships to neighboring multicast routers. Version 3 of IGMP (IGMPv3) adds support for source filtering, that is, the ability for a system to report interest in receiving packets only from specific source addresses, or from all but specific source addresses, sent to a particular multicast address. That information may be used by multicast routing protocols to avoid delivering multicast packets from specific sources to networks where there are no interested receivers.
This document specifies IGMPv3. It is a revised version of RFC 3376 that includes clarifications and fixes for errata, and it is backward compatible with RFC 3376.
This document updates RFC 2236 and obsoletes RFC 3376.
What “Internet Standard” means
A mature, widely-implemented specification that has completed the full IETF standards process — the highest maturity level on the standards track.
The canonical text of RFC 9776 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
- RFC 9775 IRTF Code of Conduct
- RFC 9777 Multicast Listener Discovery Version 2 for IPv6
- RFC 9774 Deprecation of AS_SET and AS_CONFED_SET in BGP
- RFC 9778 IANA Considerations for Internet Group Management Protocols
- RFC 9773 ACME Renewal Information Extension
- RFC 9779 Performance Measurement for Segment Routing Networks with the MPLS Data Plane
- RFC 9772 Active Operations, Administration, and Maintenance for Use in Generic Network Virtualization Encapsulation
- RFC 9780 Bidirectional Forwarding Detection for Multipoint Networks over Point-to-Multipoint MPLS Label Switched Paths