Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI4HO callsign genealogy
Currently held by TIMBLIN, MARK R
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 AI4HO's current licensee, walking backwards.
- TIMBLIN, MARK RFLgranted 2009-03-24cancelled 2012-04-28
Successor callsigns
Callsigns held now by people who previously held AI4HO.
- TIMBLIN, MARK RFLgranted 2009-03-24cancelled 2012-04-28
All historical holders
Every license row we've seen with the callsign AI4HO, oldest first.
- TIMBLIN, MARK R FL2004-12-01 → cancelled 2009-03-24
- TIMBLIN, MARK R FL2022-03-22 active