Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0ISM callsign genealogy
Currently held by Martinez, Isaac S
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 W0ISM's current licensee, walking backwards.
- MARTINEZ, ISAAC SCOgranted 2008-06-26cancelled 2008-08-12
Successor callsigns
Callsigns held now by people who previously held W0ISM.
No current licensee on record previously held this callsign.