Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N6TMB callsign genealogy
Currently held by SUGINO, LORETTA 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 N6TMB's current licensee, walking backwards.
- Birtley, Thomas MCOgranted 2012-08-23cancelled 2018-03-20
Successor callsigns
Callsigns held now by people who previously held N6TMB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N6TMB, oldest first.
- SUGINO, LORETTA J CA1998-06-12 → cancelled 2010-06-15
- Birtley, Thomas M CO2018-03-20 active