Invalid Call Sign Requests

Last updated Thursday, July 16, 2026 5:57:47 AM (Arizona)
Thursday, July 16, 2026 12:57:47 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
 A5QZ Call does not fall within a valid group as per FCC Guidelines
 A7PRCCall does not fall within a valid group as per FCC Guidelines
AA7PRC6.  Any 2-by-3 format call sign having the letters AA-AL as the prefix
AV5LP 3.  Any call sign having the letters AM-AZ as the prefix (these prefixes are assigned to other countries by the ITU)
AV5P  3.  Any call sign having the letters AM-AZ as the prefix (these prefixes are assigned to other countries by the ITU)
DL1TDLCall does not fall within a valid group as per FCC Guidelines
KG7PPRCCall sign is incorrectly formatted as per FCC Guidelines
 M4MAGCall does not fall within a valid group as per FCC Guidelines
 M4WILCall does not fall within a valid group as per FCC Guidelines
MB1TDLCall does not fall within a valid group as per FCC Guidelines
ML1TDLCall does not fall within a valid group as per FCC Guidelines
MN1HRLCall does not fall within a valid group as per FCC Guidelines
N0MN0Call sign is incorrectly formatted as per FCC Guidelines
NN7PRC7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NP8VD 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
SA7BRYCall does not fall within a valid group as per FCC Guidelines
SM7BRYCall does not fall within a valid group as per FCC Guidelines
WK9PDB8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WK9PKW8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT9AJR8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)