Network Time Protocol (NTP) Parameters
2010-03-25
2023-05-03
NTP Reference Identifier Codes
First Come First Served
Codes beginning with the character "X" are reserved for experimentation and
development. IANA cannot assign them.
GOES
Geosynchronous Orbit Environment Satellite
GPS
Global Position System
GAL
Galileo Positioning System
PPS
Generic pulse-per-second
IRIG
Inter-Range Instrumentation Group
WWVB
LF Radio WWVB Ft. Collins, CO 60 kHz
DCF
LF Radio DCF77 Mainflingen, DE 77.5 kHz
HBG
LF Radio HBG Prangins, HB 75 kHz
MSF
LF Radio MSF Anthorn, UK 60 kHz
JJY
LF Radio JJY Fukushima, JP 40 kHz, Saga, JP 60 kHz
LORC
MF Radio LORAN C station, 100 kHz
TDF
MF Radio Allouis, FR 162 kHz
CHU
HF Radio CHU Ottawa, Ontario
WWV
HF Radio WWV Ft. Collins, CO
WWVH
HF Radio WWVH Kauai, HI
NIST
NIST telephone modem
ACTS
NIST telephone modem
USNO
USNO telephone modem
PTB
European telephone modem
DFM
UTC(DFM)
NTP Kiss-o'-Death Codes
First Come First Served
Codes beginning with the character "X" are reserved for experimentation and
development. IANA cannot assign them.
ACST
The association belongs to a unicast server
AUTH
Server authentication failed
AUTO
Autokey sequence failed
BCST
The association belongs to a broadcast server
CRYP
Cryptographic authentication or identification failed
DENY
Access denied by remote server
DROP
Lost peer in symmetric mode
RSTR
Access denied due to local policy
INIT
The association has not yet synchronized for the first time
MCST
The association belongs to a dynamically discovered server
NKEY
No key found. Either the key was never installed or is not trusted
NTSN
Network Time Security (NTS) negative-acknowledgment (NAK)
RFC8915, Section 5.7
RATE
Rate exceeded. The server has temporarily denied access
because the client exceeded the rate threshold
RMOT
Alteration of association from a remote host running ntpdc.
STEP
A step change in system time has occurred, but the association has not
yet resynchronized
NTP Extension Field Types
IETF Review
0x0002
No-Operation Request
0x0104
Unique Identifier
RFC8915, Section 5.3
0x0204
NTS Cookie
RFC8915, Section 5.4
0x0304
NTS Cookie Placeholder
RFC8915, Section 5.5
0x0404
NTS Authenticator and Encrypted Extension Fields
RFC8915, Section 5.6
0x8002
No-Operation Response
0xC002
No-Operation Error Response
0x0102
Association Message Request
0x8102
Association Message Response
0xC102
Association Message Error Response
0x0202
Certificate Message Request
0x8202
Certificate Message Response
0xC202
Certificate Message Error Response
0x0302
Cookie Message Request
0x8302
Cookie Message Response
0xC302
Cookie Message Error Response
0x0402
Autokey Message Request
0x8402
Autokey Message Response
0xC402
Autokey Message Error Response
0x0502
Leapseconds Message Request
0x8502
Leapseconds Message Response
0xC502
Leapseconds Message Error Response
0x0602
Sign Message Request
0x8602
Sign Message Response
0xC602
Sign Message Error Response
0x0702
IFF Identity Message Request
0x8702
IFF Identity Message Response
0xC702
IFF Identity Message Error Response
0x0802
GQ Identity Message Request
0x8802
GQ Identity Message Response
0xC802
GQ Identity Message Error Response
0x0902
MV Identity Message Request
0x8902
MV Identity Message Response
0xC902
MV Identity Message Error Response
0x2005
Checksum Complement
DFM A/S
https://dfm.dk
2023-05-03
Jürgen Appel
DFM A/S
mailto:jap&dfm.dk
2023-05-03