Internet Protocol Version 4 (IPv4) Parameters

Last Updated
2018-05-03
Available Formats

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Registries Included Below

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

CSV
Copy Class Number Value Name Reference
0 0 0 0 
EOOL   - End of Options List
 [RFC 791][Jon_Postel]
0 0 1 1 
NOP    - No Operation
 [RFC 791][Jon_Postel]
1 0 2 130 
SEC    - Security
 [RFC 1108]
1 0 3 131 
LSR    - Loose Source Route
 [RFC 791][Jon_Postel]
0 2 4 68 
TS     - Time Stamp
 [RFC 791][Jon_Postel]
1 0 5 133 
E-SEC  - Extended Security
 [RFC 1108]
1 0 6 134 
CIPSO  - Commercial Security
 [draft-ietf-cipso-ipsecurity-01]
0 0 7 7 
RR     - Record Route
 [RFC 791][Jon_Postel]
1 0 8 136 
SID    - Stream ID
 [RFC 791][Jon_Postel][RFC 6814][1]
1 0 9 137 
SSR    - Strict Source Route
 [RFC 791][Jon_Postel]
0 0 10 10 
ZSU    - Experimental Measurement
 [ZSu]
0 0 11 11 
MTUP   - MTU Probe
 [RFC 1063][RFC 1191][1]
0 0 12 12 
MTUR   - MTU Reply
 [RFC 1063][RFC 1191][1]
1 2 13 205 
FINN   - Experimental Flow Control
 [Greg_Finn]
1 0 14 142 
VISA   - Experimental Access Control
 [Deborah_Estrin][RFC 6814][1]
0 0 15 15 
ENCODE - ???
 [VerSteeg][RFC 6814][1]
1 0 16 144 
IMITD  - IMI Traffic Descriptor
 [Lee]
1 0 17 145 
EIP    - Extended Internet Protocol
 [RFC 1385][RFC 6814][1]
0 2 18 82 
TR     - Traceroute
 [RFC 1393][RFC 6814][1]
1 0 19 147 
ADDEXT - Address Extension
 [Ullmann IPv7][RFC 6814][1]
1 0 20 148 
RTRALT - Router Alert
 [RFC 2113]
1 0 21 149 
SDB    - Selective Directed Broadcast
 [Charles_Bud_Graff][RFC 6814][1]
1 0 22 150 
       - Unassigned (Released 18 October 2005)
1 0 23 151 
DPS    - Dynamic Packet State
 [Andy_Malis][RFC 6814][1]
1 0 24 152 
UMP    - Upstream Multicast Pkt.
 [Dino_Farinacci][RFC 6814][1]
0 0 25 25 
QS     - Quick-Start
 [RFC 4782]
0 0 30 30 
EXP    - RFC3692-style Experiment [2]
 [RFC 4727]
0 2 30 94 
EXP    - RFC3692-style Experiment [2]
 [RFC 4727]
1 0 30 158 
EXP    - RFC3692-style Experiment [2]
 [RFC 4727]
1 2 30 222 
EXP    - RFC3692-style Experiment [2]
 [RFC 4727]

IPv4 Router Alert Option Values

Registration Procedure(s)
IETF Review
Reference
[RFC 5350]
Available Formats

CSV
Value Description Reference
0 Router shall examine packet [RFC 2113]
1-32 Aggregated Reservation Nesting Level [RFC 3175]
33-64 QoS NSLP Aggregation Levels 0-31 [RFC 5974]
65 NSIS NATFW NSLP [RFC 5973]
66-65502 Unassigned
65503-65534 Reserved for experimental use [RFC 5350]
65535 Reserved [RFC 5350]

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 [RFC 791][RFC 1122].

IP TOS Parameters

Registration Procedure(s)
Registrations no longer accepted
Note
This registry was deprecated following the publication of [RFC 2474].

Type-of-Service Values

Registration Procedure(s)
Registrations no longer accepted
Note
This registry was deprecated following the publication of [RFC 2474].

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.