Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1HTD callsign genealogy
Currently held by MARCH, THOMAS J
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 W1HTD's current licensee, walking backwards.
- Kollig, FrankGAgranted 2021-02-16cancelled 2021-04-06
Successor callsigns
Callsigns held now by people who previously held W1HTD.
- Kollig, FrankGAgranted 2021-12-03
All historical holders
Every license row we've seen with the callsign W1HTD, oldest first.
- MARCH, THOMAS J CA2003-09-17 → cancelled 2015-12-15
- Kollig, Frank GA2021-04-06 → cancelled 2021-12-03