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 661

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
2008-05-29	661-748	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - CA	649C	BKFD MAIN	CA
2008-05-28	661-579	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - CA	649C	LANCASTER	CA
2008-05-27	661-524	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	LANCASTER	CA
2008-04-02	661-376	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	BKFD MAIN	CA
2008-04-02	661-412	0–9 XXXall 10 · 6 holders which blocks →	AT&T ENTERPRISES, LLC	516C	BKFD SOUTH	CA
2007-12-21	661-374	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - CA	649C	BKFD MAIN	CA
2007-11-28	661-200	0–9 XXXall 10 · 8 holders which blocks →	PACIFIC BELL	9740	SNCA NHCS	CA
2007-09-15	661-369	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	BKFD MAIN	CA
2007-06-11	661-368	0–9 XXXall 10 · 5 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	BKFD NORTH	CA
2007-05-07	661-348	0–9 XXXall 10 · 3 holders which blocks →	BHN IP ENABLED SERVICES, LLC	045L	BKFD MAIN	CA
2007-04-12	661-346	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	BKFD MAIN	CA
2007-01-17	661-208	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	PLDL PLDL	CA
2006-12-14	661-390	0–9 XXXall 10 · 3 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	ARVIN	CA
2006-10-24	661-526	0–9 XXXall 10 · 6 holders which blocks →	AT&T ENTERPRISES, LLC	516C	PLDL PLDL	CA
2006-08-25	661-480	0–9 XXXall 10 · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	PLDL PLDL	CA
2006-06-16	661-476	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	SNCA NHCS	CA
2006-05-19	661-865	0–9 XXXall 10 · 3 holders which blocks →	UTILITY TELECOM GROUP, LLC - CA	9262	BKFD MAIN	CA
2006-02-22	661-794	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	PLDL PLDL	CA
2006-01-24	661-578	0–9 XXXall 10 · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	BKFD MAIN	CA
2005-06-03	661-302	0–9 XXXall 10 · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	BKFD MAIN	CA
2005-05-16	661-431	0–9 XXXall 10 · 4 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	BKFD MAIN	CA
2005-04-06	661-742	0–9 XXXall 10 · 3 holders which blocks →	AT&T ENTERPRISES, LLC	516C	BKFD MAIN	CA
2005-03-01	661-487	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BKFD MAIN	CA
2004-08-12	661-442	not yet reported which blocks →	SHELCOMM	0051	SNCA NHCS	CA
2003-01-13	661-360	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SNCA SGCC	CA
2003-01-09	661-350	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PLDL PLDL	CA
2002-10-15	661-695	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7128	BKFD NORTH	CA
2002-10-11	661-377	4XXX5XXX6XXX8XXX · 2 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	BKFD MAIN	CA
2002-08-30	661-860	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	PLDL PLDL	CA
2002-08-21	661-679	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	BKFD NORTH	CA
2002-08-09	661-705	6XXX which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	SNCA NHCS	CA
2002-03-12	661-735	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	BKFD SOUTH	CA
2002-03-12	661-829	0–9 XXXall 10 · 6 holders which blocks →	PACIFIC BELL	9740	BKFD NORTH	CA
2002-02-20	661-347	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	SNCA SGCC	CA
2002-02-20	661-349	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	PLDL PLDL	CA
2002-02-15	661-340	5XXX6XXX7XXX8XXX9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BKFD MAIN	CA
2002-02-11	661-209	3XXX which blocks →	METROPCS NETWORKS, LLC	899D	PLDL AGDL	CA
2002-02-11	661-212	none assigned yet which blocks →	METROPCS NETWORKS, LLC	899D	SNCA SGCC	CA
2002-02-11	661-213	0XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks →	METROPCS, INC.	5562	BKFD NORTH	CA
2002-01-16	661-220	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	ARVIN	CA
2002-01-16	661-221	1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	T-MOBILE USA, INC.	6529	MOJAVE	CA
2002-01-16	661-292	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	T-MOBILE USA, INC.	6529	SHAFTER	CA
2002-01-16	661-293	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	T-MOBILE USA, INC.	6529	TAFT	CA
2002-01-16	661-300	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	TEHACHAPI	CA
2001-12-14	661-317	not yet reported which blocks →	T-MOBILE USA, INC.	6529	PLDL PLDL	CA
2001-12-14	661-373	not yet reported which blocks →	T-MOBILE USA, INC.	6529	SNCA NHCS	CA
2001-12-14	661-472	not yet reported which blocks →	T-MOBILE USA, INC.	6529	BKFD MAIN	CA
2001-11-13	661-477	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	BKFD MAIN	CA
2001-11-13	661-750	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	TEHACHAPI	CA
2001-10-10	661-492	none assigned yet which blocks →	T-MOBILE USA, INC.	6529	LANCASTER	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.