Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N5OO callsign genealogy
Currently held by Mulhollan, Gregory A
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 N5OO's current licensee, walking backwards.
- Mulhollan, Gregory ATXgranted 2006-07-18cancelled 2007-03-27
Successor callsigns
Callsigns held now by people who previously held N5OO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N5OO, oldest first.
- RIDINGS JR, WILLIS A OK1998-10-28 → cancelled 2002-05-06
- Mulhollan, Gregory A TX2017-01-12 active