Differentiated Services Field Codepoints (DSCP)

Last Updated

2026-05-13

Note

The Differentiated Services (Diffserv) architecture specifies use 
of the DS field in the IPv4 and IPv6 packet headers to carry one
of 64 distict differentiated services field codepoint (DSCP) values. 
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 [RFC 8126], a pool of 
16 codepoints (Pool 2) to be reserved for experimental or Local Use 
(EXP/LU) as defined in [RFC 8126], 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. Pool 3 codepoints are now utilized for 
standardized assignments and are no longer available for experimental
or local use, as specified by [RFC 8436]. The pools are defined in the 
following table (where 'x' refers to either '0' or '1').
  

Available Formats

XML
HTML
TXT

Registries Included Below

• Differentiated Services Field Codepoints (DSCP)
  • DSCP Pool 1 Codepoints
  • DSCP Pool 3 Codepoints
• ECN Field (Bits 6-7)

Differentiated Services Field Codepoints (DSCP)

Reference

[RFC 2474][RFC3260, Section 4]

Note

See [RFC 9435] for considerations when assigning
a new codepoint from the DSCP registry.
    

Available Formats

CSV

ECN Field (Bits 6-7)

Registration Procedure(s)

RFC Required

Reference

[RFC 3168]

Note

The registrations are identical for IPv4 and IPv6.
    

Available Formats

CSV

Footnote

ECT(1) is for experimental use only [RFC8311, Section 4.2]