Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1RZO callsign genealogy
Currently held by MC NAMARA, RUTH M
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 K1RZO's current licensee, walking backwards.
- SMITH, DAVID JNHgranted 2010-12-14cancelled 2014-12-09
Successor callsigns
Callsigns held now by people who previously held K1RZO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K1RZO, oldest first.
- MC NAMARA, RUTH M NH1998-09-01 → cancelled 2009-08-27
- SMITH, DAVID J NH2024-12-12 active