X.400
E749673
X.400 is a suite of ITU-T and ISO/IEC standards that define a formal, message-oriented electronic mail system used primarily in enterprise and governmental environments.
All labels observed (6)
| Label | Occurrences |
|---|---|
| X.400 canonical | 6 |
| CCITT X.400 series | 1 |
| X.400 MHS | 1 |
| X.400 Message Handling System | 1 |
| X.400 and SMTP mail gateways | 1 |
| X.400 electronic mail | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8650253 — 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: X.400 Context triple: [RFC 1443, relatesToProtocol, X.400]
-
A.
X.25
X.25 is an early ITU-T packet-switched network protocol standard widely used for WAN communication before the rise of modern IP-based networks.
-
B.
X.500
X.500 is an ITU-T and ISO/IEC standard series that defines a directory service model and protocols for distributed, hierarchical storage and retrieval of information about networked entities.
-
C.
RFC 943
RFC 943 is an Internet standards document that superseded RFC 870 by providing updated specifications for early TCP/IP networking protocols.
-
D.
Standard for the Format of ARPA Internet Text Messages
Standard for the Format of ARPA Internet Text Messages is the seminal specification that defined the syntax and structure of electronic mail messages on the early ARPANET, forming the basis for modern Internet email formats.
-
E.
RFC 903
RFC 903 is the Internet standard document that specifies the Reverse Address Resolution Protocol (RARP), which maps link-layer (hardware) addresses to IP addresses in early TCP/IP networks.
- 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: X.400 Target entity description: X.400 is a suite of ITU-T and ISO/IEC standards that define a formal, message-oriented electronic mail system used primarily in enterprise and governmental environments.
-
A.
X.25
X.25 is an early ITU-T packet-switched network protocol standard widely used for WAN communication before the rise of modern IP-based networks.
-
B.
X.500
X.500 is an ITU-T and ISO/IEC standard series that defines a directory service model and protocols for distributed, hierarchical storage and retrieval of information about networked entities.
-
C.
RFC 943
RFC 943 is an Internet standards document that superseded RFC 870 by providing updated specifications for early TCP/IP networking protocols.
-
D.
Standard for the Format of ARPA Internet Text Messages
Standard for the Format of ARPA Internet Text Messages is the seminal specification that defined the syntax and structure of electronic mail messages on the early ARPANET, forming the basis for modern Internet email formats.
-
E.
RFC 903
RFC 903 is the Internet standard document that specifies the Reverse Address Resolution Protocol (RARP), which maps link-layer (hardware) addresses to IP addresses in early TCP/IP networks.
- F. None of above. chosen
Statements (62)
| Predicate | Object |
|---|---|
| instanceOf |
ISO/IEC standard
ⓘ
ITU-T recommendation ⓘ email standard ⓘ messaging protocol suite ⓘ |
| addressingScheme |
Originator/Recipient address
ⓘ
structured O/R address ⓘ |
| alsoKnownAs |
X.400 MHS
ⓘ
linked to:
X.400
X.400 Message Handling System ⓘ
linked to:
X.400
|
| competesWith | Internet email (SMTP/MIME) ⓘ |
| definedBy |
ISO/IEC
ⓘ
ITU-T ⓘ
linked to:
ITU Telecommunication Standardization Sector
International Organization for Standardization ⓘ International Telecommunication Union ⓘ |
| designGoal |
carrier-grade messaging
ⓘ
interoperable messaging between heterogeneous systems ⓘ support for large-scale organizational messaging ⓘ |
| firstStandardized | 1984 ⓘ |
| hasAccessProtocol |
P3 protocol
ⓘ
P7 protocol ⓘ |
| hasGatewayProtocol | P22 protocol ⓘ |
| hasProperty |
formal message model
ⓘ
rich delivery semantics ⓘ strong typing of message content ⓘ support for gateways to other email systems ⓘ |
| hasTransportProtocol | P1 protocol ⓘ |
| hasUserProtocol | P2 protocol ⓘ |
| includesComponent |
Access Unit
ⓘ
Message Handling System ⓘ Message Store ⓘ Message Transfer Agent ⓘ Message Transfer System ⓘ User Agent ⓘ |
| influenced | later secure messaging standards ⓘ |
| partOf |
Open Systems Interconnection model
ⓘ
linked to:
OSI protocol suite
|
| primaryUse |
message-oriented electronic mail
ⓘ
store-and-forward messaging ⓘ |
| provides |
binary content support
ⓘ
content type negotiation ⓘ message authentication ⓘ message confidentiality ⓘ message integrity ⓘ multi-part message support ⓘ security labels ⓘ |
| relatedStandard | X.500 ⓘ |
| standardFamily | ITU-T X-series recommendations ⓘ |
| supports |
delivery reports
ⓘ
interpersonal messaging ⓘ message security services ⓘ message storage ⓘ message transfer ⓘ non-repudiation services ⓘ receipt notifications ⓘ reliable delivery ⓘ system-to-system messaging ⓘ |
| typicalDeployment |
enterprise environments
ⓘ
governmental environments ⓘ |
| usedBy |
aviation messaging systems
ⓘ
financial sector messaging systems ⓘ military messaging systems ⓘ |
| uses |
X.500 directory services
ⓘ
linked to:
X.500
distinguished names for addressing ⓘ |
| usesModel |
OSI model
ⓘ
linked to:
OSI protocol suite
|
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: X.400 Description of subject: X.400 is a suite of ITU-T and ISO/IEC standards that define a formal, message-oriented electronic mail system used primarily in enterprise and governmental environments.
Referenced by (11)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: X.400
linked to: X.400
linked to: X.400
linked to: X.400
Using the Internet DNS to Distribute MIXER Conformant Global Address Mapping (MCGAM)
→
appliesTo
→
X.400 and SMTP mail gateways
ⓘ
linked to: X.400