Network Time Protocol
E42445
Network Time Protocol (NTP) is a widely used networking protocol designed to synchronize the clocks of computers and devices over packet-switched, variable-latency data networks.
All labels observed (20)
How this entity was disambiguated
This entity first appeared as the object of triple T322236 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Network Time Protocol Context triple: [PTP, competesWith, Network Time Protocol]
-
A.
IEEE 1588 Precision Time Protocol standard
The IEEE 1588 Precision Time Protocol standard defines a method for highly accurate time synchronization over packet-based networks, widely used in industrial automation, telecommunications, and power systems.
-
B.
IEEE 802.1AS timing and synchronization standard
The IEEE 802.1AS timing and synchronization standard defines precise time synchronization mechanisms for time-sensitive networking over Ethernet, enabling coordinated, low-latency communication in applications such as industrial automation and audio/video transport.
-
C.
International Atomic Time
International Atomic Time is a high-precision time standard based on the combined output of atomic clocks worldwide, serving as the fundamental reference for modern civil and scientific timekeeping.
-
D.
Internet Protocol
Internet Protocol is the core networking protocol that defines how data packets are addressed and routed across interconnected computer networks, forming the foundation of the modern internet.
-
E.
Coordinated Universal Time
Coordinated Universal Time (UTC) is the primary global time standard by which the world regulates clocks and time, serving as the basis for most civil time zones.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Network Time Protocol Target entity description: Network Time Protocol (NTP) is a widely used networking protocol designed to synchronize the clocks of computers and devices over packet-switched, variable-latency data networks.
-
A.
IEEE 1588 Precision Time Protocol standard
The IEEE 1588 Precision Time Protocol standard defines a method for highly accurate time synchronization over packet-based networks, widely used in industrial automation, telecommunications, and power systems.
-
B.
IEEE 802.1AS timing and synchronization standard
The IEEE 802.1AS timing and synchronization standard defines precise time synchronization mechanisms for time-sensitive networking over Ethernet, enabling coordinated, low-latency communication in applications such as industrial automation and audio/video transport.
-
C.
International Atomic Time
International Atomic Time is a high-precision time standard based on the combined output of atomic clocks worldwide, serving as the fundamental reference for modern civil and scientific timekeeping.
-
D.
Internet Protocol
Internet Protocol is the core networking protocol that defines how data packets are addressed and routed across interconnected computer networks, forming the foundation of the modern internet.
-
E.
Coordinated Universal Time
Coordinated Universal Time (UTC) is the primary global time standard by which the world regulates clocks and time, serving as the basis for most civil time zones.
- F. None of above. chosen
Statements (55)
| Predicate | Object |
|---|---|
| instanceOf |
network protocol
ⓘ
time synchronization protocol ⓘ |
| abbreviation | NTP ⓘ |
| canUse |
GPS receivers as reference clocks
ⓘ
atomic clocks as reference clocks ⓘ radio clocks as reference clocks ⓘ |
| currentVersion |
NTPv4
ⓘ
linked to:
Network Time Protocol
|
| defaultPort | 123/UDP ⓘ |
| definedIn | RFC 5905 ⓘ |
| defines |
stratum 0 reference clocks
ⓘ
stratum 1 primary time servers ⓘ stratum 2 secondary time servers ⓘ |
| designedBy | David L. Mills ⓘ |
| epoch | 1900-01-01 00:00:00 UTC ⓘ |
| firstSpecified | 1985 ⓘ |
| handles | variable-latency data networks ⓘ |
| hasAlternative |
Precision Time Protocol
ⓘ
linked to:
IEEE 1588 Precision Time Protocol standard
Simple Network Time Protocol ⓘ
linked to:
Network Time Protocol
|
| isUsedBy |
embedded systems
ⓘ
network infrastructure devices ⓘ operating systems ⓘ servers ⓘ |
| layer | application layer ⓘ |
| messageMode |
broadcast
ⓘ
client-server ⓘ manycast ⓘ multicast ⓘ symmetric active ⓘ symmetric passive ⓘ |
| operatesOn | packet-switched networks ⓘ |
| previouslyDefinedIn | RFC 1305 ⓘ |
| purpose | synchronize clocks of computers and devices ⓘ |
| securityExtension |
NTP Autokey
ⓘ
NTS for NTP ⓘ
linked to:
Network Time Protocol
|
| standardizedBy |
IETF
ⓘ
linked to:
Internet Engineering Task Force
|
| supports |
time synchronization over local area networks
ⓘ
time synchronization over the Internet ⓘ |
| timeRepresentation | 64-bit timestamp ⓘ |
| timeSource | UTC ⓘ |
| timestampFormat | 32 bits seconds and 32 bits fractional seconds ⓘ |
| typicalAccuracy |
better than one millisecond on local area networks
ⓘ
within a few milliseconds over the public Internet ⓘ |
| uses |
Marzullo's algorithm
ⓘ
User Datagram Protocol ⓘ
linked to:
UDP
clock discipline algorithms ⓘ clock filtering algorithms ⓘ clock selection algorithms ⓘ hierarchical system of time sources ⓘ offset calculation between client and server ⓘ round-trip delay measurement ⓘ stratum model ⓘ |
| version |
NTPv1
ⓘ
linked to:
Network Time Protocol
NTPv2 ⓘ
linked to:
Network Time Protocol
NTPv3 ⓘ
linked to:
Network Time Protocol
NTPv4 ⓘ
linked to:
Network Time Protocol
|
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Network Time Protocol Description of subject: Network Time Protocol (NTP) is a widely used networking protocol designed to synchronize the clocks of computers and devices over packet-switched, variable-latency data networks.
Referenced by (68)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
subject linked to:
David L. Mills
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol
linked to: Network Time Protocol