Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WP4AKB callsign genealogy
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 WP4AKB's current licensee, walking backwards.
- Mercado-Martin, Joaquin MPRgranted 2019-09-25cancelled 2019-10-16
Successor callsigns
Callsigns held now by people who previously held WP4AKB.
- Borrero-Emmanuelli, EneryPRgranted 2019-04-17cancelled 2019-05-07
All historical holders
Every license row we've seen with the callsign WP4AKB, oldest first.
- Mercado-Martin, Joaquin M PR2019-10-16 active
- —— → cancelled 1999-07-09