UDP Speed Test Protocol (UDPSTP)

Created
2025-09-26
Last Updated
2026-05-08
Note
Values reserved for Experimental Use are not expected to be used on 
the Internet but are expected to be used for experiments that are 
confined to closed environments.
Available Formats

XML
HTML
TXT

Registries Included Below

PDU Identifier

Expert(s)
Ruediger Geib, Len Ciavattone, Xiao Min
Reference
[RFC 9946]
Available Formats

CSV
Range Registration Procedures
0x0000 Reserved
0x0001-0x7F00 Specification Required
0x7F01-0x7FE0 Experimental Use
0x7FE1-0x7FFF Private Use
0x8000-0xFFFE IETF Review
0xFFFF Reserved
Value Description Reference Change Controller
0x0000 Reserved [RFC 9946] IETF
0x7F01-0x7FE0 Reserved for Experimental Use [RFC 9946] IETF
0x7FE1-0x7FFF Reserved for Private Use [RFC 9946] IETF
0xACE1 Test Setup PDU [RFC 9946] IETF
0xACE2 Test Activation PDU [RFC 9946] IETF
0xBEEF Load PDU [RFC 9946] IETF
0xDEAD Null PDU [RFC 9946] IETF
0xFEED Status Feedback PDU [RFC 9946] IETF
0xFFFF Reserved [RFC 9946] IETF

Protocol Version

Expert(s)
Ruediger Geib, Len Ciavattone, Xiao Min
Reference
[RFC 9946]
Available Formats

CSV
Range Registration Procedures
0-19 Reserved
20-40960 IETF Review
40961-53248 Specification Required
53249-65534 Experimental Use
65535 Reserved
Value Reference Change Controller
20 [RFC 9946] IETF

Test Setup PDU Modifier Bitmap

Reference
[RFC 9946]
Available Formats

CSV
Range Registration Procedures
00000000-01111111 IETF Review
10000000 Reserved
Value Description Reference
0x00 No modifications [RFC 9946]
0x01 Allow Jumbo datagram sizes above sending rates of 1 Gbps [RFC 9946]
0x02 Use Traditional MTU (1500 bytes with an IP header) [RFC 9946]

Test Setup PDU Authentication Mode

Reference
[RFC 9946]
Available Formats

CSV
Range Registration Procedures
0-59 IETF Review
60-63 Experimental Use
64-255 Reserved
Value Description Reference
0 Not used [RFC 9946]
1 Required authentication for the Control phase [RFC 9946]
2 Required authentication for the Control and Data phases [RFC 9946]

Test Setup PDU Command Response Field

Expert(s)
Ruediger Geib, Len Ciavattone, Xiao Min
Reference
[RFC 9946]
Available Formats

CSV
Range Registration Procedures
0-127 IETF Review
128-239 Specification Required
240-249 Experimental Use
250-254 Private Use
255 Reserved
Value Description Reference Change Controller
0 None (used by client in Request) [RFC 9946] IETF
1 Acknowledgment [RFC 9946] IETF
2 Bad protocol version [RFC 9946] IETF
3 Invalid Jumbo datagram option [RFC 9946] IETF
4 Unexpected authentication in Setup Request [RFC 9946] IETF
5 Authentication missing in Setup Request [RFC 9946] IETF
6 Invalid authentication method [RFC 9946] IETF
7 Authentication failure [RFC 9946] IETF
8 Authentication time is invalid in Setup Request [RFC 9946] IETF
9 No maximum test bit rate specified [RFC 9946] IETF
10 Server maximum bit rate exceeded [RFC 9946] IETF
11 MTU option does not match server [RFC 9946] IETF
12 Multi-connection parameters rejected by server [RFC 9946] IETF
13 Connection allocation failure on server [RFC 9946] IETF
14-239 Unassigned
240-249 Reserved for Experimental Use [RFC 9946] IETF
250-254 Reserved for Private Use [RFC 9946] IETF
255 Reserved [RFC 9946] IETF

Test Activation PDU Command Request

Expert(s)
Ruediger Geib, Len Ciavattone, Xiao Min
Reference
[RFC 9946]
Available Formats

CSV
Range Registration Procedures
0-127 IETF Review
128-239 Specification Required
240-249 Experimental Use
250-254 Private Use
255 Reserved
Value Description Reference Change Controller
0 No Request [RFC 9946] IETF
1 Request test in upstream direction (client to server) [RFC 9946] IETF
2 Request test in downstream direction (server to client) [RFC 9946] IETF
3-239 Unassigned
240-249 Reserved for Experimental Use [RFC 9946] IETF
250-254 Reserved for Private Use [RFC 9946] IETF
255 Reserved [RFC 9946] IETF

Test Activation PDU Modifier Bitmap

Reference
[RFC 9946]
Available Formats

CSV
Range Registration Procedures
00000000-01111111 IETF Review
10000000 Reserved
Value Description Reference
0x00 No modifications [RFC 9946]
0x01 Set when srIndexConf is start rate for search [RFC 9946]
0x02 Set for randomized UDP payload [RFC 9946]

Test Activation PDU Rate Adjustment Algo

Reference
[RFC 9946]
Note
The algorithm identifier is a capitalized alphabetic UTF-8 value (A-Z), 
specified by the corresponding incremental numeric.
Available Formats

CSV
Range Registration Procedures
A-Y IETF Review
Z Reserved
Value (Numeric) Description Reference
A(n/a) Not used [RFC 9946]
B(0) Rate algorithm Type B [Y.1540Amd2]
C(1) Rate algorithm Type C [TR-471]

Test Activation PDU Command Response Field

Expert(s)
Ruediger Geib, Len Ciavattone, Xiao Min
Reference
[RFC 9946]
Available Formats

CSV
Range Registration Procedures
0-127 IETF Review
128-239 Specification Required
240-249 Experimental Use
250-254 Private Use
255 Reserved
Value Description Reference Change Controller
0 None (used by client in Request) [RFC 9946] IETF
1 Server acknowledgment [RFC 9946] IETF
2 Server indicates an error [RFC 9946] IETF
3-239 Unassigned
240-249 Reserved for Experimental Use [RFC 9946] IETF
250-254 Reserved for Private Use [RFC 9946] IETF
255 Reserved [RFC 9946] IETF