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

KP4SMM

Cancelled

MENDEZ MARRERO, SONIA

Location: CAROLINA, PR
Class: Amateur Extra
Granted: 2023-09-09
Expires: 2033-09-09
Previous call: WP4SUP
FRN: 0033720632

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Vanity availability

312d

Available on 2027-07-19

KP4SMM cancelled on 2025-07-19. Hold ends in 312 days.

Last held by MENDEZ MARRERO, SONIA (PR).

Confidence: High

Cancelled licenses begin the 2-year hold immediately on the cancellation date, so this is the firm release date per §97.19.

Callsign genealogy

Previously held by current licensee

WP4SUPcancelled· G
MENDEZ MARRERO, SONIAPRgranted 2023-05-09cancelled 2023-09-09

Prior holders later became

KP4MSactive· E
MENDEZ MARRERO, SONIAPRgranted 2025-07-19

License history

0 events

No recorded events.

More vanity slots coming available

From Puerto Rico

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

Starting with KP4

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 →