Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9GPH callsign genealogy
Currently held by Hartman, Gregory P
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 W9GPH's current licensee, walking backwards.
- Hartman, Gregory PINgranted 2025-12-16cancelled 2026-01-16
Successor callsigns
Callsigns held now by people who previously held W9GPH.
- HOLTZMAN, DOUG MWIgranted 2000-07-26cancelled 2000-09-12
All historical holders
Every license row we've seen with the callsign W9GPH, oldest first.
- HOLTZMAN, DOUG M WI2000-05-19 → cancelled 2000-07-26
- Hartman, Gregory P IN2026-01-16 active