2010-01-20 2011-08-19 The authoritative registry for NLPIDs is maintained by ISO/IEC is successive editions of their document number 9577. Only a limited range of values are available for possible IANA allocation. See RFC 6328, particularly Section 2.3 IETF Review 0x00 Null 0x08 Q.933 0x80 IEEE SNAP 0x81 ISO CLNP (Connectionless Network Protocol) 0x82 ISO ES-IS 0x83 IS-IS 0x8E IPv6 0xB0 FRF.9 0xB1 FRF.12 0xC0 TRILL 0xC1 IEEE 802.1aq 0xC2-0xCB Unassigned 0xCC IPv4 0xCD-0xCE Unassigned 0xCF PPP