Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W1COL callsign genealogy
Currently held by Lim, Howard Y
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 W1COL's current licensee, walking backwards.
- LIM, HOWARD YWAgranted 2022-07-15cancelled 2023-06-22
Successor callsigns
Callsigns held now by people who previously held W1COL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1COL, oldest first.
- MROZ, FRANK M NH2010-11-04 → cancelled 2022-11-29
- Lim, Howard Y WA2023-06-22 active