Invalid Call Sign Requests

Last updated Thursday, September 24, 2026 5:51:43 AM (Arizona)
Thursday, September 24, 2026 12:51:43 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
AA7NAV6.  Any 2-by-3 format call sign having the letters AA-AL as the prefix
AB7NAV6.  Any 2-by-3 format call sign having the letters AA-AL as the prefix
AC7NAV6.  Any 2-by-3 format call sign having the letters AA-AL as the prefix
AD7NAV6.  Any 2-by-3 format call sign having the letters AA-AL as the prefix
AK0WTF6.  Any 2-by-3 format call sign having the letters AA-AL as the prefix
AL7NAV6.  Any 2-by-3 format call sign having the letters AA-AL as the prefix
AN5WB 3.  Any call sign having the letters AM-AZ as the prefix (these prefixes are assigned to other countries by the ITU)
AN5YZ 3.  Any call sign having the letters AM-AZ as the prefix (these prefixes are assigned to other countries by the ITU)
BD3PCLCall does not fall within a valid group as per FCC Guidelines
 C0MMSCall does not fall within a valid group as per FCC Guidelines
KKAZTGCall sign is incorrectly formatted as per FCC Guidelines
NA7CWN7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NB7CWN7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NC7CWN7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
ND7CWN7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NO0DLE7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
WC7CWN8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WP7H  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
WP9R  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