There are over 2500 RFC's. Each RFC is known by a number. For instance, RFC 1180 presents a tutorial on TCP/IP, RFC 1920 lists the current standards RFC's and explains the RFC standards process, and RFC 1941 is a FAQ list on the topic of Internet deployment in educational establishments.
MX record. A mail exchanger record (MX record) is a type of resource record in the Domain Name System that specifies a mail server responsible for accepting email messages on behalf of a recipient's domain, and a preference value used to prioritize mail delivery if multiple mail servers are available.
The Mexican peso (sign : $ ; code: MXN) is the currency of Mexico. Modern peso and dollar currencies have a common origin in the 15thâ19th century Spanish dollar, most continuing to use its sign, $ .he current ISO 4217 code for the peso is MXN; prior to the 1993 revaluation (see below), the code MXP was used. The peso is subdivided into 100 centavos, represented by  Â¢ . As of August 11, 2015, the peso's exchange rate was $18.07 per euro and $16.36 per U.S. dollar.