Código FN is a Regional Mexican music group from Tamarindo, Sinaloa, Mexico. The band was originally called Fundillo Norteño, but changed their name to Código FN while keeping the initials of their old nickname. The group started out in 2008 as a hobby among friends, performing at local events and restaurants. They became popular in the Sinaloa disco scene for their authentic northern regional rhythm. Some say that Código FN is one of the most successful and acclaimed Mexican popular music groups in recent years.