Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4DIY callsign genealogy
Currently held by London, Albert S
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 N4DIY's current licensee, walking backwards.
- London, Albert SFLgranted 2001-06-19cancelled 2001-08-07
Successor callsigns
Callsigns held now by people who previously held N4DIY.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4DIY, oldest first.
- LONDON, ALBERT S FL1988-02-02 → cancelled 2000-02-03
- London, Albert S FL2021-05-14 active