Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N6MTB callsign genealogy
Currently held by Porter Jr., William M
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 N6MTB's current licensee, walking backwards.
- Porter Jr., William MCAgranted 2022-09-03cancelled 2022-09-24
Successor callsigns
Callsigns held now by people who previously held N6MTB.
- Larson, Jeff TCAgranted 2019-03-09
All historical holders
Every license row we've seen with the callsign N6MTB, oldest first.
- Larson, Jeff T CA2016-03-01 → cancelled 2019-03-09
- Porter Jr., William M CA2022-09-24 active