RFC 1236 · INFORMATIONAL · 1991
WED · 29 JUL 2026
IP to X.121 address mapping for DDN
Overview
RFC 1236, “IP to X.121 address mapping for DDN”, is an Informational document published in June 1991 by L. Morales, P. Hasse. The canonical text is published by the RFC Editor.
Abstract
This memo defines a standard way of converting IP addresses to CCITT X.121 addresses and is the recommended standard for use on the Internet, specifically for the Defense Data Network (DDN). This memo provides information for the Internet community. It does not specify an Internet standard.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
Read this RFC
The canonical text of RFC 1236 is hosted at rfc-editor.org. Available in TXT,HTML.
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