Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4TZD callsign genealogy
Currently held by Blackburn, Clifford K
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 W4TZD's current licensee, walking backwards.
- Blackburn, Clifford KTNgranted 2013-07-22cancelled 2013-08-13
Successor callsigns
Callsigns held now by people who previously held W4TZD.
No current licensee on record previously held this callsign.