uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-14

N4SRV 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 N4SRV's current licensee, walking backwards.

  1. KI4CZScancelled· E
    READINGER SR, DONALD JSCgranted 2013-02-05cancelled 2013-03-09
  2. KD6ONScancelled· T
    READINGER SR, DONALD JSCgranted 2002-09-28cancelled 2003-11-20

Successor callsigns

Callsigns held now by people who previously held N4SRV.

  1. KB1CTMcancelled· G
    HEAVNER, MICHAEL WMDgranted 2008-04-17cancelled 2013-05-17

All historical holders

Every license row we've seen with the callsign N4SRV, oldest first.

  • READINGER SR, DONALD J SC
    2023-08-30 active
  • —
    — → cancelled 1998-05-04
← Back to N4SRV License history →