Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MFB callsign genealogy
Currently held by Brennan, Mark F
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 K4MFB's current licensee, walking backwards.
- Brennan, Mark FORgranted 2008-02-08cancelled 2008-03-28
Successor callsigns
Callsigns held now by people who previously held K4MFB.
No current licensee on record previously held this callsign.