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

KP4JM

Active

MASSO, JOSE M

Location: CAGUAS, PR
Class: Amateur Extra
Granted: 2024-05-23
Expires: 2034-07-15
Previous call: KP4FBM
FRN: 0018208405

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Vanity availability

Held

Currently held

KP4JM 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

KP4FBMactive· T
BALAEZ, FREDYPRgranted 2019-03-05
WP4QVZcancelled· T
BALAEZ, FREDYPRgranted 2018-12-03cancelled 2019-03-05

Prior holders later became

N1MIGactive· E
FUENTES, JORGE LFLgranted 2022-07-22

License history

0 events

No recorded events.

More vanity slots coming available

From Puerto Rico

All →

WP4TLD 2026-09-10
K5DTC 2026-09-14
WP4LKC 2026-09-14
KP4ECD 2026-09-16
WP3TU 2026-09-16

Starting with KP4

All →

KP4ECD PR · 2026-09-16
KP4ED PR · 2026-10-05
KP4CH IN · 2026-10-11
KP4DEU PR · 2026-10-12
KP4GN PR · 2026-11-02

Full history → Vanity availability → Callsign genealogy →