Internet Assigned Numbers Authority

                                                Internet Group Management Protocol (IGMP) Type Numbers

   Created
   2002-02-06

   Last Updated
   2025-03-28

   Note

 The Internet Group Message Protocol (IGMP) has many messages
 that are identified by a "type" field.

 Note that the original definition of IGMP in [RFC1112] divided
 this field into two 4-bit values, "version" and "type".  This
 was decided to be too restrictive, so the fields were combined
 into a single 8-bit type space.


   Available Formats
   [IMG]
   XML [IMG]
   HTML [IMG]
   Plain text

   Registries included below

     • IGMP Type Numbers
     • "Code" Fields

          • Type 0x11 - IGMP Membership Query
          • Type 0x12 - IGMPv1 Membership Report
          • Type 0x13 - DVMRP
          • Type 0x14 - PIM version 1
          • Type 0x16 - IGMPv2 Membership Report
          • Type 0x17 - IGMPv2 Leave Group
          • Type 0x1e - Multicast Traceroute Response
          • Type 0x1f - Multicast Traceroute
          • Type 0x22 - IGMPv3 Membership Report
          • Type 0xf0-0xff - Reserved for experimentation

     • IGMP/MLD Extension Types
     • IGMP/MLD Query Message Flags
     • IGMP/MLD Report Message Flags

IGMP Type Numbers

   Registration Procedure(s)

 Standards Action

   Reference
   [RFC9778]

   Available Formats
   [IMG]
   CSV

     Type                 Name                        Reference
     0x00    Reserved
   0x01-0x08 Reserved (Obsolete)            [RFC988]
   0x09-0x10 Unassigned
     0x11    IGMP Membership Query          [RFC1112]
     0x12    IGMPv1 Membership Report       [RFC1112]
     0x13    DVMRP                          [draft-ietf-idmr-dvmrp-v3-11]
     0x14    PIM version 1                  [draft-ietf-idmr-pim-spec-02]
     0x15    Cisco Trace Messages
     0x16    IGMPv2 Membership Report       [RFC2236]
     0x17    IGMPv2 Leave Group             [RFC2236]
     0x1e    Multicast Traceroute Response  [Bill_Fenner]
     0x1f    Multicast Traceroute           [Bill_Fenner]
     0x22    IGMPv3 Membership Report       [RFC9776]
     0x30    Multicast Router Advertisement [RFC4286]
     0x31    Multicast Router Solicitation  [RFC4286]
     0x32    Multicast Router Termination   [RFC4286]
   0xf0-0xff Reserved for experimentation   [RFC9778]

"Code" Fields

   Registration Procedure(s)

 Standards Action

   Reference
   [RFC9778]

   Note

 Many of these IGMP types have a "code" field.  Here we list
 the types again with their assigned code fields.

  Type 0x11 - IGMP Membership Query

   Reference
   [RFC1112]

   Available Formats
   [IMG]
   CSV

   Code                    Name
     0                IGMP Version 1
   1-255 IGMP Version 2 or above Max Response Time

  Type 0x12 - IGMPv1 Membership Report

   Reference
   [RFC1112]

        Code            Name
   No registrations at this time.

  Type 0x13 - DVMRP

   Reference
   [draft-ietf-idmr-dvmrp-v3-11]

   Available Formats
   [IMG]
   CSV

   Code        Name
    1          Probe
    2      Route Report
    3    Old Ask Neighbors
    4   Old Neighbors Reply
    5      Ask Neighbors
    6     Neighbors Reply
    7          Prune
    8          Graft
    9        Graft Ack

  Type 0x14 - PIM version 1

   Reference
   [draft-ietf-idmr-pim-spec-02]

   Available Formats
   [IMG]
   CSV

   Code     Name
    0       Query
    1     Register
    2   Register-Stop
    3    Join/Prune
    4   RP-Reachable
    5      Assert
    6       Graft
    7     Graft Ack
    8       Mode

  Type 0x16 - IGMPv2 Membership Report

   Reference
   [RFC2236]

        Code            Name
   No registrations at this time.

  Type 0x17 - IGMPv2 Leave Group

   Reference
   [RFC2236]

        Code            Name
   No registrations at this time.

  Type 0x1e - Multicast Traceroute Response

   Reference
   [Bill_Fenner]

        Code            Name
   No registrations at this time.

  Type 0x1f - Multicast Traceroute

   Reference
   [Bill_Fenner]

        Code            Name
   No registrations at this time.

  Type 0x22 - IGMPv3 Membership Report

   Reference
   [RFC9776]

        Code            Name
   No registrations at this time.

  Type 0xf0-0xff - Reserved for experimentation

   Reference
   [RFC9778]

        Code            Name
   No registrations at this time.

IGMP/MLD Extension Types

   Reference
   [RFC9279]

   Available Formats
   [IMG]
   CSV

      Range    Registration Procedures
   0-65533     IETF Review
   65534-65535 Experimental Use

   Extension Type  Length              Name              Reference
         0        variable No-op                         [RFC9279]
      1-65533              Unassigned
    65534-65535   variable Reserved for Experimental Use [RFC9279]

IGMP/MLD Query Message Flags

   Registration Procedure(s)

 Standards Action

   Reference
   [RFC9778]

   Available Formats
   [IMG]
   CSV

   Flags Bit Short Name Description Reference
       0     E          Extension   [RFC9279]
      1-3    Unassigned

IGMP/MLD Report Message Flags

   Registration Procedure(s)

 Standards Action

   Reference
   [RFC9778]

   Available Formats
   [IMG]
   CSV

   Flags Bit Short Name Description Reference
       0     E          Extension   [RFC9279]
     1-15    Unassigned

                                                                 Contact Information

        ID          Name              Contact URI           Last Updated
   [Bill_Fenner] Bill Fenner mailto:fenner&research.att.com

   Licensing Terms