An RFC can have one of seven statuses:
Informational: Intended to provide information for the Internet community. It does not state an IETF standard of any type, although other organizations' standards are sometimes republished as Informational RFCs for convenience.
Experimental: A specification for use within a limited-scope experiment.
Best Current Practice (BCP): An IETF recommendation as to the best practice in some area or the best practice that some part of the IETF complex should follow.
Proposed Standard: The first step on the standardization ladder. It indicates that the IETF is likely to standardize something in the particular area and it should not have any obvious flaws in it. Not considered to have any assurance of stability. ...