Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W5MRK callsign genealogy
Currently held by JOOSTEN, MARK 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 W5MRK's current licensee, walking backwards.
- JOOSTEN, MARK MNMgranted 1997-11-17cancelled 2004-04-13
Successor callsigns
Callsigns held now by people who previously held W5MRK.
- SHERER, MARK AALgranted 2000-05-05cancelled 2012-05-08
All historical holders
Every license row we've seen with the callsign W5MRK, oldest first.
- SHERER, MARK A AL1999-12-24 → cancelled 2000-05-05
- JOOSTEN, MARK M NM2024-05-11 active