Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9OHM callsign genealogy
Currently held by Sullivan, Robert J
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 W9OHM's current licensee, walking backwards.
- SULLIVAN, ROBERT JILgranted 1993-07-06cancelled 2000-01-21
Successor callsigns
Callsigns held now by people who previously held W9OHM.
No current licensee on record previously held this callsign.