Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WA1AB callsign genealogy
Currently held by ROUTOS, COSTAS J
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 WA1AB's current licensee, walking backwards.
- Takahashi, YukinobuCAgranted 2020-07-08cancelled 2021-05-14
Successor callsigns
Callsigns held now by people who previously held WA1AB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WA1AB, oldest first.
- ROUTOS, COSTAS J NH2007-09-11 → cancelled 2019-09-18
- Takahashi, Yukinobu CA2021-05-14 active