Confidence: Medium · Source: FCC ULS · As of 2026-09-10

KB3KEY

Cancelled

Mountcastle, John H

Location: MOUNT AIRY, MD
Class: Amateur Extra
Granted: 2023-07-04
Expires: 2033-09-08
FRN: 0009552993

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Vanity availability

Available

Available now

KB3KEY cleared its 2-year hold on 2026-03-26. Eligible for vanity application.

Last held by Mountcastle, John H (MD).

Confidence: High

Cancelled licenses begin the 2-year hold immediately, so this date is the firm release date per §97.19. Already past — fileable subject to FCC verification.

Callsign genealogy

Full chain →

Prior holders later became

AC3LUactive· E
Mountcastle, John HMDgranted 2023-07-04

License history

0 events

No recorded events.

More vanity slots coming available

From Maryland

All →

N3JTJ 2026-09-12
KB3ZFH 2026-09-13
KC3MJH 2026-09-13
KC3ZPN 2026-09-13
KB3HRU 2026-09-18

Starting with KB3

All →

KB3HBB PA · 2026-09-10
KB3ZFA PA · 2026-09-10
KB3ZFB PA · 2026-09-10
KB3ZFD PA · 2026-09-11
KB3ZFE PA · 2026-09-13

Full history → Vanity availability → Callsign genealogy →