Invalid Call Sign Requests

Last updated Thursday, June 18, 2026 6:05:45 AM (Arizona)
Thursday, June 18, 2026 1:05:45 PM (UTC)

Applications

Invalid Call Signs

This page shows the FCC guidelines for calls which are not available for requesting on an FCC application followed by the invalid call signs which have been requested in the last month and the rule they are in violation of.

The following call signs are not available for assignment and therefore any request for call signs in the following categories are invalid and will be denied.

  1. KA2AA-KA9ZZ, KC4AAA-KC4AAF, KC4USA-KC4USZ, KG4AA-KG4ZZ, KC6AA-KC6ZZ, KL9KAA- KL9KHZ, KX6AA-KX6ZZ;
  2. Any call sign having the letters SOS or QRA-QUZ as the suffix;
  3. Any call sign having the letters AM-AZ as the prefix (these prefixes are assigned to other countries by the ITU);
  4. Any 2-by-3 format call sign having the letter X as the first letter of the suffix;
  5. Any 2-by-3 format call sign having the letters AF, KF, NF, or WF as the prefix and the letters EMA as the suffix (U.S Government FEMA stations);
  6. Any 2-by-3 format call sign having the letters AA-AL as the prefix;
  7. Any 2-by-3 format call sign having the letters NA-NZ as the prefix;
  8. Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs);
  9. Any 2-by-3 format call sign having the letters KP, NP or WP as the prefix and the numeral 0, 6, 7, 8 or 9;
  10. Any 2-by-2 format call sign having the letters KP, NP or WP as the prefix and the numeral 0, 6, 7, 8 or 9;
  11. Any 2-by-1 format call sign having the letters KP, NP or WP as the prefix and the numeral 0, 6, 7, 8 or 9;
  12. Call signs having the single letter prefix (K, N or W), a single digit numeral 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 and a single letter suffix are reserved for the special event call sign system.
Call SignRule Violation
 A0WX Call does not fall within a valid group as per FCC Guidelines
 A1WX Call does not fall within a valid group as per FCC Guidelines
 A2WX Call does not fall within a valid group as per FCC Guidelines
 A3WX Call does not fall within a valid group as per FCC Guidelines
 A4GW Call does not fall within a valid group as per FCC Guidelines
 A4WCHCall does not fall within a valid group as per FCC Guidelines
 A4WX Call does not fall within a valid group as per FCC Guidelines
 A5WX Call does not fall within a valid group as per FCC Guidelines
 A6WX Call does not fall within a valid group as per FCC Guidelines
 A7WX Call does not fall within a valid group as per FCC Guidelines
 A8MWBCall does not fall within a valid group as per FCC Guidelines
 A8PB Call does not fall within a valid group as per FCC Guidelines
 A8REVCall does not fall within a valid group as per FCC Guidelines
 A8UACCall does not fall within a valid group as per FCC Guidelines
 A8WX Call does not fall within a valid group as per FCC Guidelines
 A8XE Call does not fall within a valid group as per FCC Guidelines
 A9CH Call does not fall within a valid group as per FCC Guidelines
 A9KH Call does not fall within a valid group as per FCC Guidelines
 A9WX Call does not fall within a valid group as per FCC Guidelines
 B0WLFCall does not fall within a valid group as per FCC Guidelines
K28NIQCall sign is incorrectly formatted as per FCC Guidelines
KP7NW 10.  Any 2-by-2 format call sign having the letters KP, NP or WP as the prefix and the numeral 0, 6, 7, 8 or 9
 N1QUE2.  Any call sign having the letters SOS or QRA-QUZ as the suffix
NX4XXX4.  Any 2-by-3 format call sign having the letter X as the first letter of the suffix
NY7TTA7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
RW7TTACall does not fall within a valid group as per FCC Guidelines
VA7TTACall does not fall within a valid group as per FCC Guidelines
VY7TTACall does not fall within a valid group as per FCC Guidelines
W28NIQCall sign is incorrectly formatted as per FCC Guidelines
WT1BON8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)