Invalid Call Sign Requests

Last updated Tuesday, December 16, 2025 6:39:35 AM (Arizona)
Tuesday, December 16, 2025 1:39:35 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
 A2KTGCall does not fall within a valid group as per FCC Guidelines
 A4KTGCall does not fall within a valid group as per FCC Guidelines
 B4BHGCall does not fall within a valid group as per FCC Guidelines
DV5DOGCall does not fall within a valid group as per FCC Guidelines
DV5EEECall does not fall within a valid group as per FCC Guidelines
DV5GGGCall does not fall within a valid group as per FCC Guidelines
DV5JAMCall does not fall within a valid group as per FCC Guidelines
DV5JDGCall does not fall within a valid group as per FCC Guidelines
DV5KKKCall does not fall within a valid group as per FCC Guidelines
DV5POPCall does not fall within a valid group as per FCC Guidelines
DV5RAPCall does not fall within a valid group as per FCC Guidelines
DV5TIPCall does not fall within a valid group as per FCC Guidelines
DV5TTTCall does not fall within a valid group as per FCC Guidelines
IH9S  Call does not fall within a valid group as per FCC Guidelines
NJ5MDC7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NJ5TFD7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NU4CBW7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NU5CBW7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
 T2GAKCall does not fall within a valid group as per FCC Guidelines
 T4GAKCall does not fall within a valid group as per FCC Guidelines
WC1ILY8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WR1ILY8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT1ILY8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
XC9P  Call does not fall within a valid group as per FCC Guidelines