Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W3LS callsign genealogy
Currently held by Serbin, Timothy W
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 W3LS's current licensee, walking backwards.
- Otten, MaryORgranted 2023-03-14cancelled 2024-06-15
Successor callsigns
Callsigns held now by people who previously held W3LS.
- DAVIS, FREDERICK WMDgranted 2000-05-02cancelled 2002-04-20
All historical holders
Every license row we've seen with the callsign W3LS, oldest first.
- MC NALLY, WILLIAM C PA1988-03-01 → cancelled 2000-03-02
- DAVIS, FREDERICK W FL2000-04-11 → cancelled 2000-05-02
- Serbin, Timothy W TX2012-05-15 → cancelled 2024-05-25
- Otten, Mary OR2024-06-15 active