Host mnemonics proposed in RFC 226
RFC 239, “Host mnemonics proposed in RFC 226”, is an Unknown document published in September 1971 by R.T. Braden. The canonical text is published by the RFC Editor.
What “Unknown” means
The standards-track status of this early RFC was never formally classified.
The canonical text of RFC 239 is hosted at rfc-editor.org. Available in TXT,HTML.