Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4PUP callsign genealogy
Currently held by WOODRUFF, DAVID 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 K4PUP's current licensee, walking backwards.
- Mayer, DonaldWAgranted 2025-11-25cancelled 2026-01-09
Successor callsigns
Callsigns held now by people who previously held K4PUP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4PUP, oldest first.
- WOODRUFF, DAVID J FL1998-03-03 → cancelled 2010-03-04
- Woodruff, David J FL2013-04-09 → cancelled 2025-04-10
- Mayer, Donald WA2026-01-09 active