Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1FAB callsign genealogy
Currently held by 104TH COMMUNICATIONS FLIGHT MASS ANG
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by K1FAB's current licensee, walking backwards.
- Birtwell, Frederick AMAgranted 2013-06-14cancelled 2016-05-06
Successor callsigns
Callsigns held now by people who previously held K1FAB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K1FAB, oldest first.
- 104TH COMMUNICATIONS FLIGHT MASS ANG MA2000-01-13 → cancelled 2012-01-14
- Birtwell, Frederick A MA2016-05-06 active