Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9TP callsign genealogy
Currently held by PIEPENBRINK, THOMAS O
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 K9TP's current licensee, walking backwards.
- MAY, MARK JILgranted 1999-01-19cancelled 2000-09-12
Successor callsigns
Callsigns held now by people who previously held K9TP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9TP, oldest first.
- PIEPENBRINK, THOMAS O IN1988-08-23 → cancelled 2000-08-24
- MAY, MARK J IL2020-07-13 active