A tax number, in Mexico, assigned to legal persons. A Request for Comments (RFC) is a publication from the Internet Society (ISOC) and its. Memos in the RFC document series contain technical and organizational notes about. A Request for Comments (RFC) is a formal document from the Internet Engineering Task Force (IETF) that is the result of committee drafting and subsequent. An RFC (Request for Comments) is a pure technical document published by the.