2010-01-20 2017-10-13 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. , 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