Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N1PI callsign genealogy
Currently held by Clark, William 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 N1PI's current licensee, walking backwards.
- Clark, William JFLgranted 2000-09-14cancelled 2009-11-07
Successor callsigns
Callsigns held now by people who previously held N1PI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N1PI, oldest first.
- BLACKWOOD, COLONEL C MA1997-10-15 → cancelled 2009-10-16
- Clark, William J FL2020-08-28 active