Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W3PHP callsign genealogy
Currently held by Duff, Thomas D
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 W3PHP's current licensee, walking backwards.
- Estes, Morgan WOKgranted 2021-11-10cancelled 2021-12-17
Successor callsigns
Callsigns held now by people who previously held W3PHP.
- Duff, Thomas DNJgranted 2018-11-17
All historical holders
Every license row we've seen with the callsign W3PHP, oldest first.
- Duff, Thomas D NJ2018-09-05 → cancelled 2018-11-17
- Estes, Morgan W OK2021-12-17 active