Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4RDC callsign genealogy
Currently held by CALLAHAN, ROBERT D
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 W4RDC's current licensee, walking backwards.
- CALLAHAN, ROBERT Dcancelled 1998-04-22
Successor callsigns
Callsigns held now by people who previously held W4RDC.
No current licensee on record previously held this callsign.