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

K6MEX

Active

CASTILLO, CESAR A

Location: REDWOOD CITY, CA
Class: Technician
Granted: 2019-05-07
Expires: 2029-06-30
Previous call: KI6YRK
FRN: 0018719724

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Vanity availability

Held

Currently held

K6MEX is held by an active license; it isn't a vanity slot right now.

Vanity availability dates are computed from FCC §97.19's hold periods: 2 years from the cancellation date for cancelled or terminated licenses, 4 years from the expiration date for expired licenses (2-year renewal grace + 2-year hold).

Callsign genealogy

Full chain →

Previously held by current licensee

KI6YRKcancelled· T
CASTILLO JR, CESAR ACAgranted 2009-04-23cancelled 2009-06-30

Prior holders later became

W6JMXcancelled· E
DE LEON, CARLOSCAgranted 2016-06-17cancelled 2016-08-16

License history

0 events

No recorded events.

More vanity slots coming available

From California

All →

KC6OZS 2026-09-09
KD6MWG 2026-09-09
KG6NDR 2026-09-09
KG6NDX 2026-09-09
KG6NEF 2026-09-09

Starting with K6

All →

K6DJM CA · 2026-09-10
K6IGU UT · 2026-09-14
K6BSV WA · 2026-09-25
K6KA TN · 2026-09-25
K6KOA HI · 2026-10-01

Full history → Vanity availability → Callsign genealogy →