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

KB1SM callsign genealogy

Currently held by bostock, roger w

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 KB1SM's current licensee, walking backwards.

  1. KB4SMcancelled· A
    BOSTOCK, ROGER WMAgranted 2013-10-17cancelled 2020-07-17
  2. K4BBRactive· G
    Smith, Boyce RAZgranted 2026-08-11
  3. KM4QARcancelled· T
    Smith, Boyce RALgranted 2015-12-30cancelled 2016-10-29

Successor callsigns

Callsigns held now by people who previously held KB1SM.

  1. W1ZRZcancelled· A
    BOSTOCK, ROGER WFLgranted 2006-01-10cancelled 2009-12-11

All historical holders

Every license row we've seen with the callsign KB1SM, oldest first.

  • BOSTOCK, ROGER W MA
    2002-12-05 → cancelled 2006-01-10
  • bostock, roger w MA
    2020-07-17 active
← Back to KB1SM License history →