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
2013-03-25	925-239	0–9 XXXall 10 · 5 holders which blocks →	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	373F	WALNUT CRK	CA
2012-10-04	925-332	0–9 XXXall 10 · 4 holders which blocks →	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	373F	CONCORD	CA
2012-08-16	925-464	0–9 XXXall 10 · 7 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	WALNUT CRK	CA
2012-06-25	925-446	0–9 XXXall 10 · 6 holders which blocks →	METROPCS, INC.	5562	CONCORD	CA
2012-01-27	925-421	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	CONCORD	CA
2011-09-13	925-350	0–9 XXXall 10 · 8 holders which blocks →	COMCAST PHONE OF CALIFORNIA, LLC	394L	ANTIOCH	CA
2011-09-13	925-357	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	WALNUT CRK	CA
2011-07-22	925-338	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	CONCORD	CA
2011-07-19	925-334	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	CONCORD	CA
2011-05-10	925-322	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	WALNUT CRK	CA
2010-05-20	925-843	0–9 XXXwhole prefix which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	BSHP RNCH	CA
2009-02-23	925-289	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - CA	649C	WALNUT CRK	CA
2008-10-31	925-238	0–9 XXXall 10 · 5 holders which blocks →	COMCAST PHONE OF CALIFORNIA, LLC	394L	ANTIOCH	CA
2007-08-29	925-206	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	ANTIOCH	CA
2002-09-20	925-913	1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	T-MOBILE USA, INC.	6529	BSHP RNCH	CA
2002-09-20	925-914	2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	CLAYTON	CA
2002-09-20	925-915	2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	DANVILLE	CA
2002-09-20	925-917	2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	MARTINEZ	CA
2002-09-20	925-922	3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	PLEASANTON	CA
2002-08-21	925-324	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	WALNUT CRK	CA
2002-08-21	925-813	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	ANTIOCH	CA
2002-04-16	925-719	3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	DUBLN-SNRM	CA
2002-02-22	925-203	1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PITTSBURG	CA
2002-01-28	925-337	7XXX8XXX9XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	LIVERMORE	CA
2002-01-28	925-348	8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	CONCORD	CA
2002-01-28	925-353	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PLEASANTON	CA
2002-01-28	925-354	4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	ANTIOCH	CA
2001-12-28	925-325	not yet reported which blocks →	T-MOBILE USA, INC.	6529	ANTIOCH	CA
2001-12-28	925-336	2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	DUBLN-SNRM	CA
2001-11-30	925-321	3XXX4XXX5XXX7XXX8XXX9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LIVERMORE	CA
2001-11-30	925-330	3XXX4XXX5XXX7XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	WALNUT CRK	CA
2001-11-30	925-389	2XXX3XXX4XXX5XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	DANVILLE	CA
2001-10-18	925-207	none assigned yet which blocks →	METROPCS, INC.	5562	CONCORD	CA
2001-10-18	925-639	not yet reported which blocks →	T-MOBILE USA, INC.	6529	WALNUT CRK	CA
2001-09-21	925-339	not yet reported which blocks →	METROPCS, INC.	5562	LIVERMORE	CA
2001-09-21	925-565	not yet reported which blocks →	METROPCS, INC.	5562	ANTIOCH	CA
2001-09-21	925-594	4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	METROPCS, INC.	5562	DANVILLE	CA
2001-09-21	925-812	6XXX7XXX8XXX9XXX · 3 holders which blocks →	METROPCS, INC.	5562	MARTINEZ	CA
2001-09-19	925-577	2XXX which blocks →	T-MOBILE USA, INC.	6529	DUBLN-SNRM	CA
2001-08-22	925-497	not yet reported which blocks →	METROPCS, INC.	5562	CONCORD	CA
2001-08-22	925-705	4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	METROPCS, INC.	5562	WALNUT CRK	CA
2001-07-17	925-331	0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	ANTIOCH	CA
2001-07-17	925-567	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	CLAYTON	CA
2001-07-17	925-844	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	CLAYTON	CA
2001-07-16	925-791	0XXX1XXX3XXX5XXX7XXX8XXX9XXX · 2 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	DANVILLE	CA
2001-06-27	925-574	0XXX1XXX3XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	DUBLN-SNRM	CA
2001-06-25	925-768	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	CONCORD	CA
2001-05-21	925-643	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	PSBG WEST	CA
2001-05-18	925-595	none assigned yet which blocks →	METROPCS, INC.	5562	CONCORD	CA
2001-05-18	925-667	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	LIVERMORE	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.