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Confidence: Medium · Source: FCC ULS · As of 2026-09-12

KC1OOS callsign genealogy

Currently held by Shell, Martin

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 KC1OOS's current licensee, walking backwards.

  1. WZ1MCScancelled· G
    Shell, MartinMAgranted 2021-03-23cancelled 2021-04-16

Successor callsigns

Callsigns held now by people who previously held KC1OOS.

  1. AC1LLactive· E
    Shell, MartinMEgranted 2021-04-16
  2. WZ1MCScancelled· G
    Shell, MartinMAgranted 2021-03-23cancelled 2021-04-16

All historical holders

Every license row we've seen with the callsign KC1OOS, oldest first.

  • Shell, Martin MA
    2021-02-03 → cancelled 2021-03-23
  • Shell, Martin MA
    2021-04-16 → cancelled 2021-05-27
← Back to KC1OOS License history →