Internet Assigned Numbers Authority
Internet Protocol Version 4 (IPv4) Parameters
Last Updated
2018-05-03
Available Formats
[IMG]
XML [IMG]
HTML [IMG]
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Registries included below
• IP Option Numbers
• IPv4 Router Alert Option Values
• IP Time to Live Parameter
• IP TOS Parameters
• Type-of-Service Values
IP Option Numbers
Registration Procedure(s)
Not defined
Note
The Internet Protocol (IP) has provision for optional header fields
identified by an option type field. Options 0 and 1 are exactly one
octet which is their type field. All other options have their one
octet type field, followed by a one octet length field, followed by
length-2 octets of option data. The option type field is sub-divided
into a one bit copied flag, a two bit class field, and a five bit
option number. These taken together form an eight bit value for the
option type field. IP options are commonly referred to by this value.
Available Formats
[IMG]
CSV
Copy Class Number Value Name Reference
0 0 0 0 EOOL - End of Options List [RFC791][Jon_Postel]
0 0 1 1 NOP - No Operation [RFC791][Jon_Postel]
1 0 2 130 SEC - Security [RFC1108]
1 0 3 131 LSR - Loose Source Route [RFC791][Jon_Postel]
0 2 4 68 TS - Time Stamp [RFC791][Jon_Postel]
1 0 5 133 E-SEC - Extended Security [RFC1108]
1 0 6 134 CIPSO - Commercial Security [draft-ietf-cipso-ipsecurity-01]
0 0 7 7 RR - Record Route [RFC791][Jon_Postel]
1 0 8 136 SID - Stream ID [RFC791][Jon_Postel][RFC6814][1]
1 0 9 137 SSR - Strict Source Route [RFC791][Jon_Postel]
0 0 10 10 ZSU - Experimental Measurement [ZSu]
0 0 11 11 MTUP - MTU Probe [RFC1063][RFC1191][1]
0 0 12 12 MTUR - MTU Reply [RFC1063][RFC1191][1]
1 2 13 205 FINN - Experimental Flow Control [Greg_Finn]
1 0 14 142 VISA - Experimental Access Control [Deborah_Estrin][RFC6814][1]
0 0 15 15 ENCODE - ??? [VerSteeg][RFC6814][1]
1 0 16 144 IMITD - IMI Traffic Descriptor [Lee]
1 0 17 145 EIP - Extended Internet Protocol [RFC1385][RFC6814][1]
0 2 18 82 TR - Traceroute [RFC1393][RFC6814][1]
1 0 19 147 ADDEXT - Address Extension [Ullmann IPv7][RFC6814][1]
1 0 20 148 RTRALT - Router Alert [RFC2113]
1 0 21 149 SDB - Selective Directed Broadcast [Charles_Bud_Graff][RFC6814][1]
1 0 22 150 - Unassigned (Released 18 October 2005)
1 0 23 151 DPS - Dynamic Packet State [Andy_Malis][RFC6814][1]
1 0 24 152 UMP - Upstream Multicast Pkt. [Dino_Farinacci][RFC6814][1]
0 0 25 25 QS - Quick-Start [RFC4782]
0 0 30 30 EXP - RFC3692-style Experiment [2] [RFC4727]
0 2 30 94 EXP - RFC3692-style Experiment [2] [RFC4727]
1 0 30 158 EXP - RFC3692-style Experiment [2] [RFC4727]
1 2 30 222 EXP - RFC3692-style Experiment [2] [RFC4727]
IPv4 Router Alert Option Values
Registration Procedure(s)
IETF Review
Reference
[RFC5350]
Available Formats
[IMG]
CSV
Value Description Reference
0 Router shall examine packet [RFC2113]
1-32 Aggregated Reservation Nesting Level [RFC3175]
33-64 QoS NSLP Aggregation Levels 0-31 [RFC5974]
65 NSIS NATFW NSLP [RFC5973]
66-65502 Unassigned
65503-65534 Reserved for experimental use [RFC5350]
65535 Reserved [RFC5350]
IP Time to Live Parameter
Registration Procedure(s)
Not defined
Note
The current recommended default time to live (TTL) for the Internet
Protocol (IP) is 64 [RFC791][RFC1122].
IP TOS Parameters
Registration Procedure(s)
Registrations no longer accepted
Note
This registry was deprecated following the publication of [RFC2474].
Type-of-Service Values
Registration Procedure(s)
Registrations no longer accepted
Note
This registry was deprecated following the publication of [RFC2474].
Contact Information
ID Name Contact URI Last Updated
[Andy_Malis] Andy Malis mailto:agmalis&gmail.com 2013-05-28
[Charles_Bud_Graff] Charles "Bud" Graff mailto:bud&fotlan.army.mil 1995-03
[Deborah_Estrin] Deborah Estrin mailto:Estrin&usc.edu 1994-10
[Dino_Farinacci] Dino Farinacci mailto:dino&cisco.com 1999-05
[Greg_Finn] Greg Finn mailto:Finn&isi.edu 1994-10
[Jon_Postel] Jon Postel mailto:postel&isi.edu 1994-10
Footnotes
[1] obsoleted IP Option Number
[2] It is only appropriate to use these values
in explicitly-configured experiments; they MUST NOT be shipped as
defaults in implementations. See RFC 3692 for details.
Licensing Terms