Invalid Call Sign Requests

Last updated Wednesday, October 1, 2025 6:26:38 AM (Arizona)
Wednesday, October 1, 2025 1:26:38 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
 A4HW Call does not fall within a valid group as per FCC Guidelines
 A4PO Call does not fall within a valid group as per FCC Guidelines
 A4PW Call does not fall within a valid group as per FCC Guidelines
 A4WH Call does not fall within a valid group as per FCC Guidelines
 A4WP Call does not fall within a valid group as per FCC Guidelines
 A5WG Call does not fall within a valid group as per FCC Guidelines
 A8IG Call does not fall within a valid group as per FCC Guidelines
 A8RO Call does not fall within a valid group as per FCC Guidelines
AK0BLD6.  Any 2-by-3 format call sign having the letters AA-AL as the prefix
AZ7BC 3.  Any call sign having the letters AM-AZ as the prefix (these prefixes are assigned to other countries by the ITU)
 B1RJKCall does not fall within a valid group as per FCC Guidelines
 B4RJKCall does not fall within a valid group as per FCC Guidelines
 C8US Call does not fall within a valid group as per FCC Guidelines
 E6RJKCall does not fall within a valid group as per FCC Guidelines
 H6RJKCall does not fall within a valid group as per FCC Guidelines
 J1VANCall does not fall within a valid group as per FCC Guidelines
 L1ZRDCall does not fall within a valid group as per FCC Guidelines
MG3ZQ Call does not fall within a valid group as per FCC Guidelines
MG4ZQ Call does not fall within a valid group as per FCC Guidelines
MR3G  Call does not fall within a valid group as per FCC Guidelines
MR4G  Call does not fall within a valid group as per FCC Guidelines
NW1PDX7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NW3PDX7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NW5PDX7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NX5PDX7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NX9PDX7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
 O8LO Call does not fall within a valid group as per FCC Guidelines
 P0TA Call does not fall within a valid group as per FCC Guidelines
TA1LLLCall does not fall within a valid group as per FCC Guidelines
 V1JRVCall does not fall within a valid group as per FCC Guidelines
WC5OEM8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WK3BBN8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WK3KJV8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WK3PDX8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WK5PDX8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WR4BBN8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WR4KJV8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT0AST8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT5PDX8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)