Address Resolution Protocol (ARP) Parameters Last Updated 2009-04-24 Note Reverse Address Resolution Protocol Operation Codes The Reverse Address Resolution Protocol (RARP) specified in [RFC903] uses the "Reverse" codes below. DYNAMIC REVERSE ARP The Dynamic Reverse Address Resolution Protocol (DRARP) uses the "DRARP" codes below. For further information, see [RFC1931] INVERSE ADDRESS RESOLUTION PROTOCOL The Inverse Address Resolution Protocol (IARP) specified in [RFC1293] uses the "InARP" codes below. This registry is also available in XML and plain text formats. Registries included below * Operation Codes * Hardware Types * Protocol Type Operation Codes Reference [RFC826][RFC5494] Registration Procedures IETF Review or IESG Approval Number Operation Code (op) References 0 Reserved [RFC5494] 1 REQUEST [RFC826][RFC5227] 2 REPLY [RFC826][RFC5227] 3 request Reverse [RFC903] 4 reply Reverse [RFC903] 5 DRARP-Request [RFC1931] 6 DRARP-Reply [RFC1931] 7 DRARP-Error [RFC1931] 8 InARP-Request [RFC1293] 9 InARP-Reply [RFC1293] 10 ARP-NAK [RFC1577] 11 MARS-Request [Grenville_Armitage] 12 MARS-Multi [Grenville_Armitage] 13 MARS-MServ [Grenville_Armitage] 14 MARS-Join [Grenville_Armitage] 15 MARS-Leave [Grenville_Armitage] 16 MARS-NAK [Grenville_Armitage] 17 MARS-Unserv [Grenville_Armitage] 18 MARS-SJoin [Grenville_Armitage] 19 MARS-SLeave [Grenville_Armitage] 20 MARS-Grouplist-Request [Grenville_Armitage] 21 MARS-Grouplist-Reply [Grenville_Armitage] 22 MARS-Redirect-Map [Grenville_Armitage] 23 MAPOS-UNARP [Mitsuru_Maruyama][RFC2176] 24 OP_EXP1 [RFC5494] 25 OP_EXP2 [RFC5494] 26-65534 Unassigned 65535 Reserved [RFC5494] Hardware Types Reference [RFC826][RFC5494] Range Registration Procedure Notes requests for values below 256 Expert Review requests for more than one value Expert Review requests for one value greater than 255 First Come First Served requests for one value, no value specified First Come First Served can only be assigned a two-octet value (i.e., a value greater than 255) Number Hardware Type (hrd) Reference 0 Reserved [RFC5494] 1 Ethernet (10Mb) [Jon_Postel] 2 Experimental Ethernet (3Mb) [Jon_Postel] 3 Amateur Radio AX.25 [Philip_Koch] 4 Proteon ProNET Token Ring [Avri_Doria] 5 Chaos [Gill_Pratt] 6 IEEE 802 Networks [Jon_Postel] 7 ARCNET [RFC1201] 8 Hyperchannel [Jon_Postel] 9 Lanstar [Tom_Unger] 10 Autonet Short Address [Mike_Burrows] 11 LocalTalk [Joyce_K_Reynolds] 12 LocalNet (IBM PCNet or SYTEK LocalNET) [Joseph Murdock] 13 Ultra link [Rajiv_Dhingra] 14 SMDS [George_Clapp] 15 Frame Relay [Andy_Malis] 16 Asynchronous Transmission Mode (ATM) [[JXB2]] 17 HDLC [Jon_Postel] 18 Fibre Channel [RFC4338] 19 Asynchronous Transmission Mode (ATM) [RFC2225] 20 Serial Line [Jon_Postel] 21 Asynchronous Transmission Mode (ATM) [Mike_Burrows] 22 MIL-STD-188-220 [Herb_Jensen] 23 Metricom [Jonathan_Stone] 24 IEEE 1394.1995 [Myron_Hattig] 25 MAPOS [Mitsuru_Maruyama][RFC2176] 26 Twinaxial [Marion_Pitts] 27 EUI-64 [Kenji_Fujisawa] 28 HIPARP [Jean_Michel_Pittet] 29 IP and ARP over ISO 7816-3 [Scott_Guthery] 30 ARPSec [Jerome_Etienne] 31 IPsec tunnel [RFC3456] 32 InfiniBand (TM) [RFC4391] 33 TIA-102 Project 25 Common Air Interface (CAI) [Jeff Anderson, Telecommunications Industry of America (TIA) TR-8.5 Formulating Group, , June 2004] 34 Wiegand Interface [Scott_Guthery_2] 35 Pure IP [Inaky_Perez-Gonzalez] 36 HW_EXP1 [RFC5494] 37-255 Unassigned 256 HW_EXP2 [RFC5494] 257-65534 Unassigned 65535 Reserved [RFC5494] Protocol Type Reference [RFC826][RFC5494][RFC5342] Note These numbers share the Ethertype space. See: Registration Procedures The Ethertype space is administered as described in [RFC5342]. Registry is empty. People ID Name Contact URI Last Updated [Andy_Malis] Andy Malis mailto:malis_a&timeplex.com [Avri_Doria] Avri Doria mailto:avri&peoteon.com 1994-12 [George_Clapp] George Clapp mailto:meritec!clapp&bellcore.bellcore.com [Gill_Pratt] Gill Pratt mailto:gill%25mit-ccc@mc.lcs.mit.edu [Grenville_Armitage] Grenville Armitage mailto:gja&thumper.belcore.com 1995-04 [Herb_Jensen] Herb Jensen mailto:hwjensen&itt.com 1995-02 [Inaky_Perez-Gonzalez] Inaky Perez-Gonzalez mailto:inaky.perez-gonzalez&intel.com 2008-10-01 [Jean_Michel_Pittet] Jean-Michel Pittet mailto:jmp&gandalf.engr.sgi.com 1998-11 [Jerome_Etienne] Jerome Etienne mailto:jetienne&arobas.net 2000-06 [Jon_Postel] Jon Postel mailto:postel&isi.edu [Jonathan_Stone] Jonathan Stone mailto:jonathan&dsg.stanford.edu 1996-05 [Joyce_K_Reynolds] Joyce K. Reynolds mailto:jkrey&isi.edu [Kenji_Fujisawa] Kenji Fujisawa mailto:fujisawa&sm.sony.co.jp 1998-10 [Marion_Pitts] Marion Pitts mailto:marionp&vnet.ibm.com 1997-05 [Mike_Burrows] Mike Burrows mailto:burrows&src.dec.com [Mitsuru_Maruyama] Mitsuru Maruyama mailto:mitsuru&ntt-20.ecl.net 1997-03 [Myron_Hattig] Myron Hattig mailto:Myron_Hattig&ccm.jf.intel.com 1997-02 [Philip_Koch] Philip Koch mailto:Philip.Koch&dartmouth.edu [Rajiv_Dhingra] Rajiv Dhingra mailto:rajiv&ultra.com [Scott_Guthery] Scott Guthery mailto:sguthery&mobile-mind.com 2000-03 [Scott_Guthery_2] Scott Guthery mailto:sguthery&hidcorp.com 2008-09-25 [Tom_Unger] Tom Unger mailto:tom&citi.umich