---
title: x121Address
description: Data network address as defined by ITU Recommendation X.121.
component: pingds
version: 8.1
page_id: pingds:schemaref:at-x121Address
canonical_url: https://docs.pingidentity.com/pingds/8.1/schemaref/at-x121Address.html
---

# x121Address

Data network address as defined by ITU Recommendation X.121.

|                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| --------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| *OID*                       | 2.5.4.24                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| *Names*                     | x121Address                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| *Syntax*                    | [NumericString](s-NumericString.html)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| *Equality matching rule*    | [numericStringMatch](mr-numericStringMatch.html)                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| *Ordering matching rule*    | [numericStringOrderingMatch](mr-numericStringOrderingMatch.html)                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| *Substring matching rule*   | [numericStringSubstringsMatch](mr-numericStringSubstringsMatch.html)                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| *Single value*              | false: multiple values allowed                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| *User modification allowed* | true                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| *Usage*                     | userApplications                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| *Origin*                    | [RFC 4519](https://datatracker.ietf.org/doc/html/rfc4519)                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| *Schema file*               | 00-core.ldif                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| *Used by*                   | [dNSDomain](oc-dNSDomain.html), [dmd](oc-dmd.html), [domain](oc-domain.html), [inetOrgPerson](oc-inetOrgPerson.html), [organization](oc-organization.html), [organizationalPerson](oc-organizationalPerson.html), [organizationalRole](oc-organizationalRole.html), [organizationalUnit](oc-organizationalUnit.html), [pilotOrganization](oc-pilotOrganization.html), [rFC822LocalPart](oc-rFC822LocalPart.html), [residentialPerson](oc-residentialPerson.html), [sunservicecomponent](oc-sunservicecomponent.html) |