https://app.knowbase.one/vault/rfc/docid/716
RFC9436: PIM Message Type Space Extension and Reserved Bits
Internet Engineering Task Force (IETF) S. Venaas Request for Comments: 9436 Cisco Systems, Inc. Obsoletes: 8736 A. Retana Updates: 3973, 5015, 5059, 6754, 7761, Futurewei Technologies, Inc. ...