Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N6DDQ callsign genealogy
Currently held by STRATHMANN, RANDOLPH 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 N6DDQ's current licensee, walking backwards.
- STRATHMANN, RANDOLPH JCAgranted 2013-08-20cancelled 2015-12-29
Successor callsigns
Callsigns held now by people who previously held N6DDQ.
- CROMPTON, KEITH GPAgranted 2018-03-22
All historical holders
Every license row we've seen with the callsign N6DDQ, oldest first.
- STRATHMANN, RANDOLPH J CA2025-12-09 active
- CROMPTON, KEITH G— → cancelled 1998-05-28