Invalid Call Sign Requests

Last updated Wednesday, May 14, 2025 5:50:14 AM (Arizona)
Wednesday, May 14, 2025 12:50:14 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
 A0AA Call does not fall within a valid group as per FCC Guidelines
 A0DG Call does not fall within a valid group as per FCC Guidelines
 A0DRGCall does not fall within a valid group as per FCC Guidelines
 A0WW Call does not fall within a valid group as per FCC Guidelines
 A0WWWCall does not fall within a valid group as per FCC Guidelines
 A0XYZCall does not fall within a valid group as per FCC Guidelines
 A0YW Call does not fall within a valid group as per FCC Guidelines
 A0YY Call does not fall within a valid group as per FCC Guidelines
 A0ZZ Call does not fall within a valid group as per FCC Guidelines
 A1DG Call does not fall within a valid group as per FCC Guidelines
 A1DRGCall does not fall within a valid group as per FCC Guidelines
 A1ROBCall does not fall within a valid group as per FCC Guidelines
 A2DG Call does not fall within a valid group as per FCC Guidelines
 A3DG Call does not fall within a valid group as per FCC Guidelines
 A4DG Call does not fall within a valid group as per FCC Guidelines
 A5AP Call does not fall within a valid group as per FCC Guidelines
 A5DG Call does not fall within a valid group as per FCC Guidelines
 A6DG Call does not fall within a valid group as per FCC Guidelines
 A7DG Call does not fall within a valid group as per FCC Guidelines
 A7WW Call does not fall within a valid group as per FCC Guidelines
AP3X  3.  Any call sign having the letters AM-AZ as the prefix (these prefixes are assigned to other countries by the ITU)
AX0N  3.  Any call sign having the letters AM-AZ as the prefix (these prefixes are assigned to other countries by the ITU)
AZ7PNW3.  Any call sign having the letters AM-AZ as the prefix (these prefixes are assigned to other countries by the ITU)
DW1TT Call does not fall within a valid group as per FCC Guidelines
KCK521Call sign is incorrectly formatted as per FCC Guidelines
KM0EOWWCall sign is incorrectly formatted as per FCC Guidelines
KP7JAD9.  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
KP7VIX9.  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
LP5ELKCall does not fall within a valid group as per FCC Guidelines
LP5PIGCall does not fall within a valid group as per FCC Guidelines
LP5WPJCall does not fall within a valid group as per FCC Guidelines
LP5YAKCall does not fall within a valid group as per FCC Guidelines
WK6CHP8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WM5BIG8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WM5HYM8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT4LZU8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6CHP8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WTXCCall sign is incorrectly formatted as per FCC Guidelines
WZOLCall sign is incorrectly formatted as per FCC Guidelines