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Definition of RFC

The acronym RFC can refer to:

Registro Federal de Contribuyentes, in Mexico.

Request For Comments, in English.


In Mexico, it refers to a code composed of letters and numbers, used by the government to identify individuals (employees) or legal entities (companies) that carry out an economic activity in the country.

The RFC is a registry for all taxpayers to pay their taxes in an easy and organized manner. It is an alphanumeric code composed of 12 characters for companies and 13 characters for individuals.

Request For Comments (RFC) is a series of publications by the Internet Engineering Task Force (IETF), an international organization that contributes to Internet engineering.

The RFC describes aspects of the operation of the Internet and other computer networks, such as protocols, procedures and comments, and formulates ideas about them.

Each RFC is a publication that a group of engineers with expertise in the field submit to IEFT members for evaluation and feedback.


The RFCs are known as the Bible of the Internet by specialists, since they contain detailed information on how the network works.

The first RFC is dated April 7, 1969 and was created by Steve Crocket, a graduate student who had the initiative to compile the notes that his work group had been generating since its beginnings to document the work done.

These documents were devised as an informal mechanism for sharing ideas with other researchers in the network.

The RFCs are published, adopted and regulated as Internet standards by the IETF. They are the product of working groups composed of network technicians, network designers, administrators and professionals who ensure the proper functioning of the Internet architecture and its protocols.