Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K1DIY callsign genealogy
Currently held by HOWLAND, MATTHEW C
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 K1DIY's current licensee, walking backwards.
- OBrien, LiamCTgranted 2016-10-19cancelled 2018-02-24
Successor callsigns
Callsigns held now by people who previously held K1DIY.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K1DIY, oldest first.
- HOWLAND, MATTHEW C MA1994-08-13 → cancelled 2006-08-15
- OBrien, Liam CA2018-02-24 active