Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4TDR callsign genealogy
Currently held by ROBINSON, TIMOTHY 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 W4TDR's current licensee, walking backwards.
- Robinson, Timothy DSCgranted 2019-10-23cancelled 2019-11-13
Successor callsigns
Callsigns held now by people who previously held W4TDR.
- HOLMES, DANIEL GTNgranted 2017-03-31
All historical holders
Every license row we've seen with the callsign W4TDR, oldest first.
- HOLMES, DANIEL G TN2008-10-03 → cancelled 2017-03-31
- ROBINSON, TIMOTHY D SC2019-11-13 active