Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1GMP callsign genealogy
Currently held by Ostergard ., Christopher R
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 W1GMP's current licensee, walking backwards.
- Ostergard, Christopher RCTgranted 2025-04-16cancelled 2026-04-14
Successor callsigns
Callsigns held now by people who previously held W1GMP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1GMP, oldest first.
- Bupivi, Joseph P CT2006-02-27 → cancelled 2018-05-10
- Ostergard ., Christopher R CT2026-04-14 active