uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

K0ORB callsign genealogy

Currently held by MC GRANNAHAN, WILLIAM 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 K0ORB's current licensee, walking backwards.

  1. KC0VSDcancelled
    SJMC Amateur Radio ClubMOgranted 2006-01-17cancelled 2007-08-17

Successor callsigns

Callsigns held now by people who previously held K0ORB.

  1. N0ZLcancelled· E
    MC GRANNAHAN, WILLIAM WMOgranted 2001-02-21cancelled 2005-04-24

All historical holders

Every license row we've seen with the callsign K0ORB, oldest first.

  • MC GRANNAHAN, WILLIAM W MO
    1993-08-03 → cancelled 2001-02-21
  • McGrannhan Amateur Radio Foundation MO
    2017-12-11 active
← Back to K0ORB License history →