Recent prefix assignments

2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days — NPA 925

ONVOY, LLC - CA 2

New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
—	925-525	none assigned yet which blocks →	METROPCS, INC.	5562	LIVERMORE	CA
—	925-526	0XXX1XXX4XXX5XXX6XXX7XXX · 4 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	PITTSBURG	CA
—	925-527	0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX which blocks →	UTILITY TELECOM GROUP, LLC - CA	9262	WALNUT CRK	CA
—	925-528	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	T-MOBILE USA, INC.	6529	ORINDA	CA
—	925-529	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - CA	649C	ANTIOCH	CA
—	925-535	0XXX1XXX2XXX3XXX5XXX8XXX · 3 holders which blocks →	METROPCS, INC.	5562	PLEASANTON	CA
—	925-543	4XXX which blocks →	PACIFIC BELL	9740	BSHP RNCH	CA
—	925-548	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	DUBLN-SNRM	CA
—	925-549	2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	DUBLN-SNRM	CA
—	925-550	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	ANTIOCH	CA
—	925-551	1XXX2XXX · 2 holders which blocks →	PACIFIC BELL	9740	DUBLN-SNRM	CA
—	925-552	not yet reported which blocks →	PACIFIC BELL	9740	DANVILLE	CA
—	925-553	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	DANVILLE	CA
—	925-555	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	DIR ASST	CA
—	925-556	not yet reported which blocks →	PACIFIC BELL	9740	DUBLN-SNRM	CA
—	925-557	0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7240	DUBLN-SNRM	CA
—	925-558	0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	DUBLN-SNRM	CA
—	925-560	8XXX which blocks →	PACIFIC BELL	9740	DUBLN-SNRM	CA
—	925-566	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7145	CONCORD	CA
—	925-568	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7145	SUNOL	CA
—	925-570	2XXX which blocks →	T-MOBILE USA, INC.	6529	DUBLN-SNRM	CA
—	925-571	not yet reported which blocks →	NORTH COUNTY COMMUNICATION CORPORATION - CA	7894	BSHP RNCH	CA
—	925-572	not yet reported which blocks →	NORTH COUNTY COMMUNICATION CORPORATION - CA	7894	PLEASANTON	CA
—	925-573	not yet reported which blocks →	NORTH COUNTY COMMUNICATION CORPORATION - CA	7894	PITTSBURG	CA
—	925-575	2XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks →	METROPCS, INC.	5562	DANVILLE	CA
—	925-580	none assigned yet which blocks →	T-MOBILE USA, INC.	6529	PLEASANTON	CA
—	925-583	4XXX5XXX6XXX7XXX · 4 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	LIVERMORE	CA
—	925-584	3XXX which blocks →	T-MOBILE USA, INC.	6529	ANTIOCH	CA
—	925-586	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	CONCORD	CA
—	925-587	0–9 XXXall 10 · 5 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	DUBLN-SNRM	CA
—	925-588	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	WALNUT CRK	CA
—	925-592	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	MORAGA	CA
—	925-596	2XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	PLEASANTON	CA
—	925-597	4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	PITTSBURG	CA
—	925-598	not yet reported which blocks →	PACIFIC BELL	9740	PLEASANTON	CA
—	925-600	not yet reported which blocks →	PACIFIC BELL	9740	PLEASANTON	CA
—	925-602	not yet reported which blocks →	PACIFIC BELL	9740	CONCORD	CA
—	925-603	3XXX4XXX · 2 holders which blocks →	PACIFIC BELL	9740	CONCORD	CA
—	925-605	4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	MATRIX TELECOM, LLC. S/I/I TNCI - CA	7379	LIVERMORE	CA
—	925-606	not yet reported which blocks →	PACIFIC BELL	9740	LIVERMORE	CA
—	925-609	4XXX which blocks →	PACIFIC BELL	9740	CONCORD	CA
—	925-611	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	CA
—	925-623	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	T-MOBILE USA, INC.	6529	PLEASANTON	CA
—	925-625	not yet reported which blocks →	PACIFIC BELL	9740	ECONTRCOST	CA
—	925-626	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	ECONTRCOST	CA
—	925-628	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	ANTIOCH	CA
—	925-631	2XXX3XXX which blocks →	PACIFIC BELL	9740	MORAGA	CA
—	925-634	not yet reported which blocks →	PACIFIC BELL	9740	ECONTRCOST	CA
—	925-635	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7145	PITTSBURG	CA
—	925-640	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	DUBLN-SNRM	CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.