Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WC1Z callsign genealogy
Currently held by Chalkley, Mark A
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 WC1Z's current licensee, walking backwards.
- Chalkley, Mark AFLgranted 2011-12-14cancelled 2012-03-17
Successor callsigns
Callsigns held now by people who previously held WC1Z.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WC1Z, oldest first.
- WILLIAMS SR, ROBERT J MA1999-12-16 → cancelled 2012-02-07
- Chalkley, Mark A TX2022-01-19 active