Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W3TO callsign genealogy
Currently held by PFIRMAN, JAMES L
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 W3TO's current licensee, walking backwards.
- PFIRMAN, JAMES LPAgranted 1998-04-17cancelled 2006-02-22
Successor callsigns
Callsigns held now by people who previously held W3TO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W3TO, oldest first.
- SHAFFER, JACK C PA1997-10-21 → cancelled 2000-10-13
- PFIRMAN, JAMES L PA2025-12-18 active