Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4RTP callsign genealogy
Currently held by Harris, Matthew G
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 W4RTP's current licensee, walking backwards.
- Harris, Matthew GCAgranted 2020-08-03cancelled 2020-08-25
Successor callsigns
Callsigns held now by people who previously held W4RTP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4RTP, oldest first.
- SEARS, FORREST T AL2006-05-10 → cancelled 2018-06-12
- Harris, Matthew G CA2020-08-25 active