Differentiated Services Field Codepoints 

(last updated 2002-03-27)

Registries included below:
- Differentiated Services Field Codepoints
  - Pool 1 Codepoints  

Note:
The DSCP field within the DS field is capable of conveying 64 distinct
codepoints.  The codepoint space is divided into three pools for the
purpose of codepoint assignment and management: a pool of 32
codepoints (Pool 1) to be assigned by Standards Action as defined in
[RFC2434], a pool of 16 codepoints (Pool 2) to be reserved for
experimental or Local Use (EXP/LU) as defined in [RFC2434], and a pool 
of 16 codepoints (Pool 3) which are initially available for experimental
or local use, but which should be preferentially utilized for
standardized assignments if Pool 1 is ever exhausted.  The pools are
defined in the following table (where 'x' refers to either '0' or
'1').

Registry Name: Differentiated Services Field Codepoints 
Reference: [RFC2474]
Pool  Codepoint space  Registration Procedures    Note
----  ---------------  -------------------------  ---------------------------------------
1     xxxxx0           Standards Action     
2     xxxx11           Experimental or Local Use  Reserved for experimental or Local Use
3     xxxx01           Experimental or Local Use  May be utilized for future Standards Action allocations as necessary


Sub-registry: Pool 1 Codepoints 
Reference: [RFC2474]
Registration Procedures: Standards Action

Registry:
Name       Space    Reference
---------  -------  ---------
CS0        000000   [RFC2474]
CS1        001000   [RFC2474]
CS2        010000   [RFC2474]
CS3        011000   [RFC2474]
CS4        100000   [RFC2474]
CS5        101000   [RFC2474]
CS6        110000   [RFC2474]
CS7        111000   [RFC2474]
AF11       001010   [RFC2597]
AF12       001100   [RFC2597]
AF13       001110   [RFC2597]
AF21       010010   [RFC2597]
AF22       010100   [RFC2597]
AF23       010110   [RFC2597]
AF31       011010   [RFC2597]
AF32       011100   [RFC2597]
AF33       011110   [RFC2597]
AF41       100010   [RFC2597]
AF42       100100   [RFC2597]
AF43       100110   [RFC2597]
EF PHB     101110   [RFC3246]


References
----------
[RFC2434]  T. Narten, H. Alvestrand, "Guidelines for Writing an IANA 
           Considerations Section in RFCs", RFC 2434, October 1998.

[RFC2474]  Nichols, K., et. al., "Definition of the Differentiated
           Services Field (DS Field) in the IPv4 and IPv6 Headers", 
           RFC 2474, December 1998.

[RFC2597]  Heinanen, J., et. al., "Assured Forwarding PHB Group", 
           RFC 2597, June 1999.

[RFC3246]  B. Davie, A. Charny, J.C.R. Bennett, K. Benson, 
           J.Y. Le Boudec, W. Courtney, S. Davari, V. Firoiu, and
           D. Stiliadis, "An Expedited Forwarding PHB 
           (Per-Hop Behavior)", RFC 3246, March 2002.

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