Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W3CDK callsign genealogy
Currently held by HANLON SR, ROBERT M
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 W3CDK's current licensee, walking backwards.
- Kotfila, Christopher DDCgranted 2022-03-14cancelled 2022-04-08
Successor callsigns
Callsigns held now by people who previously held W3CDK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W3CDK, oldest first.
- HANLON SR, ROBERT M PA2001-09-05 → cancelled 2013-12-05
- Kotfila, Christopher D DC2022-04-08 active