hwPimGroupMappingGrpPrefixLength 1.3.6.1.4.1.2011.5.25.149.4.1.13.1.4

The multicast group prefix length, which, when combined with hwPimGroupMappingGrpAddress, gives the group prefix for this mapping. The InetAddressType is given by the hwPimGroupMappingAddressType object. If hwPimGroupMappingAddressType is 'ipv4' or 'ipv4z', this object must be in the range 4..32. If hwPimGroupMappingAddressType is 'ipv6' or 'ipv6z', this object must be in the range 8..128.