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The Federal Taxpayer Registry (Spanish: Registro Federal de Contribuyentes, RFC), also known as RFC number, is a tax identification number required by any physical or natural person or moral or juridical person (legal entity) in Mexico to carry out any lawful economic activity for which they are obliged to pay taxes, with some exceptions.
On 23 October 1996, the Presidential Agreement for the Adoption and Use of the Population Registry Unique Code by the Federal Government (Acuerdo Presidencial para la adopción y uso por la Administración Pública Federal de la Clave Única de Registro de Población) was published in the Official Gazette of the Federation.
Obsoleted by RFC 1035. RFC 883 defined "completion queries" (opcode 2 and maybe 3) which used this record. RFC 1035 later reassigned opcode 2 to be "status" and reserved opcode 3. A6 38 RFC 2874 RFC 6563 Defined as part of early IPv6 but downgraded to experimental by RFC 3363; later downgraded to historic by RFC 6563. NXT 30 RFC 2065 RFC 3755
OpenPGP is on the Internet Standards Track and is under active development. Many e-mail clients provide OpenPGP-compliant email security as described in RFC 3156. The current specification is RFC 9580 (July 2024), the successor to RFC 4880. RFC 9580 specifies a suite of required algorithms consisting of X25519, Ed25519, SHA2-256 and AES-128.
IP over Avian Carriers was initially described in RFC 1149 issued by the Internet Engineering Task Force, written by David Waitzman, and released on April 1, 1990. It is one of several April Fools' Day Request for Comments. Waitzman described an improvement of his protocol in RFC 2549, IP over Avian Carriers with Quality of Service (1
The use of the File Transfer Protocol (FTP) for "network mail" on the ARPANET was proposed in RFC 469 in March 1973. [7] Through RFC 561, RFC 680, RFC 724, and finally RFC 733 in November 1977, a standardized framework for "electronic mail" using FTP mail servers on was developed. [8] [9] SMTP grew out of these standards developed during the 1970s.