Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA2H callsign genealogy
Currently held by Xu, Tsz sum Michael
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 KA2H's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KA2H.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KA2H, oldest first.
- SOMMER, WILLIAM W NY2014-01-09 → cancelled 2026-04-10
- Xu, Tsz sum Michael CA2026-07-10 active