Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC5U callsign genealogy
Currently held by DAY, CECIL 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 AC5U's current licensee, walking backwards.
- GREVEMBERG, LEE SLAgranted 2003-10-30cancelled 2007-02-13
Successor callsigns
Callsigns held now by people who previously held AC5U.
- DAY, CECIL ATXgranted 2014-09-06
All historical holders
Every license row we've seen with the callsign AC5U, oldest first.
- DAY, CECIL A TX1998-04-06 → cancelled 2004-11-05
- GREVEMBERG, LEE S LA2017-08-30 active