Network Time Protocol

E42445

network protocol time synchronization protocol

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.

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All labels observed (14)

Label	Occurrences
Network Time Protocol canonical	10
NTP	5
NTPv3	2
NTPv4	2
Network Time Protocol Version 4: Protocol and Algorithms Specification	2
NTP reference implementation	1
NTP timestamp format	1
NTPv1	1
NTPv2	1
NTS for NTP	1
Network Time Protocol (Version 3) Specification, Implementation and Analysis	1
Network Time Protocol Working Group	1
Network Time Protocol version 3	1
Simple Network Time Protocol	1

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	Network Time Protocol self-linksurface differs ⓘ surface form: NTPv4
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	IEEE 1588 Precision Time Protocol standard ⓘ surface form: Precision Time Protocol Network Time Protocol self-linksurface differs ⓘ surface form: Simple 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 ⓘ Network Time Protocol self-linksurface differs ⓘ surface form: NTS for NTP
standardizedBy	Internet Engineering Task Force ⓘ surface form: IETF
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 ⓘ UDP ⓘ surface form: User Datagram Protocol 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	Network Time Protocol self-linksurface differs ⓘ surface form: NTPv1 Network Time Protocol self-linksurface differs ⓘ surface form: NTPv2 Network Time Protocol self-linksurface differs ⓘ surface form: NTPv3 Network Time Protocol self-linksurface differs ⓘ surface form: NTPv4

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 (30)

Full triples — surface form annotated when it differs from this entity's canonical label.

PTP → competesWith → Network Time Protocol ⓘ

PTP → isMorePreciseThan → Network Time Protocol ⓘ

Cisco IOS → supportsProtocol → Network Time Protocol ⓘ

this entity surface form: NTP

Network Time Protocol → version → Network Time Protocol self-linksurface differs ⓘ

this entity surface form: NTPv1

Network Time Protocol → version → Network Time Protocol self-linksurface differs ⓘ

this entity surface form: NTPv2

Network Time Protocol → version → Network Time Protocol self-linksurface differs ⓘ

this entity surface form: NTPv3

Network Time Protocol → version → Network Time Protocol self-linksurface differs ⓘ

this entity surface form: NTPv4

Network Time Protocol → currentVersion → Network Time Protocol self-linksurface differs ⓘ

this entity surface form: NTPv4

Network Time Protocol → securityExtension → Network Time Protocol self-linksurface differs ⓘ

this entity surface form: NTS for NTP

Network Time Protocol → hasAlternative → Network Time Protocol self-linksurface differs ⓘ

this entity surface form: Simple Network Time Protocol

RFC 868 → obsoletedBy → Network Time Protocol ⓘ

RFC 868 → supersededBy → Network Time Protocol ⓘ

this entity surface form: NTP

David L. Mills → notableWork → Network Time Protocol ⓘ

this entity surface form: NTP

David L. Mills → developed → Network Time Protocol ⓘ

this entity surface form: NTP reference implementation

David L. Mills → abbreviation → Network Time Protocol ⓘ

subject surface form: Network Time Protocol

this entity surface form: NTP

RFC 5905 → title → Network Time Protocol ⓘ

this entity surface form: Network Time Protocol Version 4: Protocol and Algorithms Specification

RFC 5905 → definesProtocol → Network Time Protocol ⓘ

RFC 5905 → workingGroup → Network Time Protocol ⓘ

this entity surface form: Network Time Protocol Working Group

RFC 5905 → defines → Network Time Protocol ⓘ

this entity surface form: NTP timestamp format

RFC 1305 → title → Network Time Protocol ⓘ

this entity surface form: Network Time Protocol (Version 3) Specification, Implementation and Analysis

RFC 1305 → specifiesProtocol → Network Time Protocol ⓘ

this entity surface form: Network Time Protocol version 3

RFC 1305 → specifiesProtocol → Network Time Protocol ⓘ

this entity surface form: NTPv3

RFC 1305 → protocolFamily → Network Time Protocol ⓘ

RFC 1305 → obsoletedBy → Network Time Protocol ⓘ

this entity surface form: Network Time Protocol Version 4: Protocol and Algorithms Specification

Marzullo's algorithm → relatedTo → Network Time Protocol ⓘ

NTP Autokey → appliesTo → Network Time Protocol ⓘ

RIPE Atlas → supportsProtocol → Network Time Protocol ⓘ

this entity surface form: NTP

PRTC → relatedTo → Network Time Protocol ⓘ

subject surface form: Primary Reference Time Clock