The use of the standard was encouraged by IETF language tags, introduced in RFC 1766 in March 1995, and continued by RFC 3066 from January 2001 and RFC 4646 from September 2006.
Ti panagusar iti pagalagadan ket pagpatageden babaen dagiti etiketa ti pagsasao ti IETF, a naipayam-ammo ti RFC 1766 idi Marso 1995, ken intultuloy ti RFC 3066 manipud idi Enero 2001 ken RFC 4646 manipud idi Septiembre 2006.