WP4OO

WP4OO is restricted to amateurs with a USPS address in Puerto Rico

WP4OO is restricted to Technician class operators or higher.

Scroll down to the applications that requested this callsign.
An Entity Name opens everything filed under that licensee’s FCC Registration Number.
A Grant Date opens all processing on that day; an Effective Date opens the license record.

Column headings link to an explanation of the column.
A bold Applicant Type marks a vanity callsign assignment.
Active licenses are listed first, then the rest by Effective Date, newest first.

Entity Name	Applicant Type	Licensee Class	Region / State	License Status	Grant Date	Effective Date	Cancel Date	Expire Date
Nieves Febus, Lillian	I - Individual	G - General	12 / PR	A - Active	2025-09-11	2025-09-11		2035-10-02
PEREZ, MAYRA E	I - Individual	P - Technician Plus	12 / PR	E - Expired	1988-05-10	1988-05-10	2000-05-11	1998-05-10

WP4OO is restricted to amateurs with a USPS address in Puerto Rico

WP4OO is restricted to Technician class operators or higher.

An Applicant callsign opens that callsign’s history; an Entity Name opens the applicant’s history.
A ULS File Number opens the application detail; a Receipt Date opens that day’s applications.

Two dates or purposes in one row mean the application was amended or withdrawn: the latest change is on top, the original underneath.
“Granted” means the application was granted, not necessarily with this callsign.
Receipt dates more than a month old have a gray background.

Receipt Date	Applicant Callsign	Region / State	Entity Name	ULS File Number	Application Purpose	Payment Date	Last Action Date	Application Status
Mon 2015-09-14	WP4PIP	12 / PR	Nieves Febus, Lillian	0006942493 I - Online	MD - Modification	(none)	2015-10-02	G - Granted
Fri 2009-06-12	WP4KZN	12 / PR	CRUZ ABREU, NELSON A	0003867127 I - Online	MD - Modification	2009-06-17	2009-06-30	G - Granted