Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WA4ZZ callsign genealogy
Currently held by HARRISON, TIMOTHY L
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 WA4ZZ's current licensee, walking backwards.
- HARRISON, TIMOTHY LTNgranted 2013-01-30cancelled 2015-02-20
Successor callsigns
Callsigns held now by people who previously held WA4ZZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WA4ZZ, oldest first.
- Slipsager, Frederick A NC1998-03-24 → cancelled 2010-03-25
- HARRISON, TIMOTHY L TN2025-04-08 active