uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

K9BT callsign genealogy

Currently held by THOMAS, BILLY F

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 K9BT's current licensee, walking backwards.

  1. AA5YZ
    no FCC ULS record on file

Successor callsigns

Callsigns held now by people who previously held K9BT.

No current licensee on record previously held this callsign.

← Back to K9BT License history →