Invalid Call Sign Requests

Last updated Sunday, September 13, 2026 9:14:36 AM (Arizona)
Sunday, September 13, 2026 4:14:36 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
 A3RM Call does not fall within a valid group as per FCC Guidelines
 A9CSVCall does not fall within a valid group as per FCC Guidelines
AK6RKT6.  Any 2-by-3 format call sign having the letters AA-AL as the prefix
AO9SV 3.  Any call sign having the letters AM-AZ as the prefix (these prefixes are assigned to other countries by the ITU)
AZ9SV 3.  Any call sign having the letters AM-AZ as the prefix (these prefixes are assigned to other countries by the ITU)
 K3V  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.
KERICCall sign is incorrectly formatted as per FCC Guidelines
KP0S  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
N6Call sign is incorrectly formatted as per FCC Guidelines
NA8TJF7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NB8TJF7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NC8TJF7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NF8TJF7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NI5SWA7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NJ0OEY7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NJ6OEY7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NL8TJF7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NM8TJF7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NT8TJF7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
UNKNOWNCall sign is incorrectly formatted as per FCC Guidelines
W6Call sign is incorrectly formatted as per FCC Guidelines
WC8TJF8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WM8TJF8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WR8TJF8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT8TJF8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)