The Anterian Numbering Plan (ANP) divides the regions of its member nations into geographic numbering plan areas (NPAs). Each area is assigned a three-digit area code which is prefixed to each telephone number issued in its service area. Some areas are assigned multiple codes in an overlay plan. These codes are separate from the country code that appears with a "+" sign in front of the number.
The rules for numbering NPAs do not permit the digits 0 and 1 as the leading digit, which also applies for central office codes. 0 has been used traditionally for operator-assisted telephone calls, and the digit 1 was traditionally ignored in switching equipment as a leading digit, because it could not be distinguished reliably from intermittent loop disconnections.
An example of a phone number in the ANP is +42 801-555-5555 where +42 represents Layfet, 801 represents Tonnes, Alexandria, Nordipolica, and several counties of the State of Albin, and 555-5555 the specific telephone number.
Used in the State of Higham (excluding the Layfet City Metropolitan Area), State of Rahles, part of the State of Albin, and part of the State of Mirvain in Layfet
Established in 1966, splitting from 801
806
Used in the State of Leonom and State of Thentar (excluding the Windsor Metropolitan Area) in Layfet
Established in 1967, splitting from 805
807
Used in the State of Epinay, part of the State of Albin, and part of the and State of Mirvain in Layfet
Established in 1966, splitting from 801
808
Not in use—reserved for potential expansion in Layfet
Number controlled by the Layfetian ANP Field Office in Windsor.
809
Not in use—reserved for potential expansion in Layfet
Number controlled by the Layfetian ANP Field Office in Windsor.
810
Not in use
811
Not in use—reserved for potential expansion in Layfet
Number controlled by the Layfetian ANP Field Office in Windsor.
812
Not in use—reserved for potential expansion in Layfet
Number controlled by the Layfetian ANP Field Office in Windsor.
813
Not in use
814
New Rucklesburg's area code, considered the "main" area code for Kistolia as it's used in the nations capital.
established in 1987
815
Not in use—reserved for potential expansion in Layfet
Number controlled by the Layfetian ANP Field Office in Windsor.
816
Not in use—reserved for potential expansion in Layfet
Number controlled by the Layfetian ANP Field Office in Windsor.
890–899
Not in use—reserved for potential expansion
Numbers controlled by the Layfetian ANP Field Office in Windsor.
900–999
Code
Territory or use
Notes
990–999
Not in use—reserved for potential expansion
Numbers controlled by the Layfetian ANP Field Office in Windsor.
