Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD6SPI callsign genealogy
Currently held by HOULIHAN, WILLIAM 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 KD6SPI's current licensee, walking backwards.
- Houlihan, William CCAgranted 2007-02-21cancelled 2007-05-15
Successor callsigns
Callsigns held now by people who previously held KD6SPI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD6SPI, oldest first.
- HOULIHAN, WILLIAM C CA1993-02-16 → cancelled 2005-02-17
- HOULIHAN, WILLIAM C CA2017-03-08 active