Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9DLP callsign genealogy
Currently held by PFEIFFER, DAVE L
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 W9DLP's current licensee, walking backwards.
- PFEIFFER, DAVE LINgranted 2011-10-04cancelled 2016-03-11
Successor callsigns
Callsigns held now by people who previously held W9DLP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9DLP, oldest first.
- WALLER, EARL E IL2003-11-19 → cancelled 2016-02-09
- PFEIFFER, DAVE L IN2026-01-22 active