Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4RTK callsign genealogy
Currently held by DURHAM, CONRAD 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 W4RTK's current licensee, walking backwards.
- Kirkland III, Richard TGAgranted 2022-03-25cancelled 2022-04-29
Successor callsigns
Callsigns held now by people who previously held W4RTK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4RTK, oldest first.
- DURHAM, CONRAD O FL1988-10-04 → cancelled 2000-10-05
- Kirkland III, Richard T GA2022-04-29 active