Invalid Call Sign Requests

Last updated Saturday, June 6, 2026 2:42:14 AM (Arizona)
Saturday, June 6, 2026 9:42:14 AM (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
 A1TACCall does not fall within a valid group as per FCC Guidelines
 A2TACCall does not fall within a valid group as per FCC Guidelines
 A3TACCall does not fall within a valid group as per FCC Guidelines
 A4TACCall does not fall within a valid group as per FCC Guidelines
 A5TACCall does not fall within a valid group as per FCC Guidelines
 A6TACCall does not fall within a valid group as per FCC Guidelines
 A7TACCall does not fall within a valid group as per FCC Guidelines
AA5JIM6.  Any 2-by-3 format call sign having the letters AA-AL as the prefix
 H4TEMCall does not fall within a valid group as per FCC Guidelines
 J4TEMCall does not fall within a valid group as per FCC Guidelines
KP0DOC9.  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
KP7NW 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
 L4TEMCall does not fall within a valid group as per FCC Guidelines
 L5TEMCall does not fall within a valid group as per FCC Guidelines
NC4TEM7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NO7WTF7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NP0DOC7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NP3DOC7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
NP6DOC7.  Any 2-by-3 format call sign having the letters NA-NZ as the prefix
ON7JDWCall does not fall within a valid group as per FCC Guidelines
SC4TEMCall does not fall within a valid group as per FCC Guidelines
VG8DETCall does not fall within a valid group as per FCC Guidelines
WK6EKG8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WO30Call sign is incorrectly formatted as per FCC Guidelines
WR4TEM8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6BCD8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6DEC8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6FDT8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6KDE8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6KEZ8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6KKD8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6KXZ8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6KZX8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6STZ8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6SZX8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6TAZ8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6TTZ8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6WEZ8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6WTZ8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6XZT4.  Any 2-by-3 format call sign having the letter X as the first letter of the suffix
WT6ZEK8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)
WT6ZKW8.  Any 2-by-3 format call sign having the letters WC, WK, WM, WR, or WT as the prefix (Group X call signs)