Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4ESU callsign genealogy
Currently held by Mammano, Philip T
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 K4ESU's current licensee, walking backwards.
- Smith, David DTNgranted 2008-10-07cancelled 2013-12-17
Successor callsigns
Callsigns held now by people who previously held K4ESU.
- Mammano, Philip TNVgranted 2017-11-09
All historical holders
Every license row we've seen with the callsign K4ESU, oldest first.
- Mammano, Philip T TN2004-08-10 → cancelled 2007-11-16
- Smith, David D SC2023-09-22 active