NIC view of standard host names
RFC 237, “NIC view of standard host names”, is an Unknown document published in October 1971 by R.W. Watson. It has been obsoleted by RFC 273 — refer to the newer document for the authoritative version. 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 237 is hosted at rfc-editor.org. Available in TXT,HTML.