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
—	661-589	not yet reported which blocks →	PACIFIC BELL	9740	BKFD NORTH	CA
—	661-591	1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	GLENNVILLE	CA
—	661-596	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	732J	BKFD MAIN	CA
—	661-599	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	BKFD SOUTH	CA
—	661-600	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	SNCA NHCS	CA
—	661-606	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	ARVIN	CA
—	661-607	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	PACIFIC BELL	9740	SNCA NHCS	CA
—	661-609	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LANCASTER	CA
—	661-611	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	CA
—	661-613	2XXX3XXX · 2 holders which blocks →	EXIANT COMMUNICATIONS LLC	114J	EDWARDS	CA
—	661-615	0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	BKFD NORTH	CA
—	661-616	7XXX8XXX which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	BKFD MAIN	CA
—	661-617	0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	BKFD SOUTH	CA
—	661-618	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	PLDL PLDL	CA
—	661-619	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	BKFD MAIN	CA
—	661-620	not yet reported which blocks →	NORTH COUNTY COMMUNICATION CORPORATION - CA	7894	SNCA SGCC	CA
—	661-621	0–9 XXXall 10 · 5 holders which blocks →	METROPCS NETWORKS, LLC	899D	SNCA SGCC	CA
—	661-622	2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	PLDL LNVY	CA
—	661-623	7XXX8XXX9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	TAFT	CA
—	661-626	not yet reported which blocks →				CA
—	661-628	not yet reported which blocks →				CA
—	661-630	0–9 XXXall 10 · 7 holders which blocks →	BHN IP ENABLED SERVICES, LLC	045L	SHAFTER	CA
—	661-631	not yet reported which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-632	6XXX which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-633	4XXX which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-634	5XXX8XXX · 2 holders which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-635	not yet reported which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-636	1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-637	3XXX5XXX6XXX9XXX · 3 holders which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-638	3XXX6XXX8XXX9XXX · 3 holders which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-641	1XXX4XXX · 2 holders which blocks →	SKYE TELECOM LLC DBA SKYETEL	622J	EDWARDS	CA
—	661-644	7XXX8XXX9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SNCA NHCS	CA
—	661-645	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SNCA NHCS	CA
—	661-650	not yet reported which blocks →				CA
—	661-654	1XXX9XXX · 2 holders which blocks →	PACIFIC BELL	9740	BKFD SOUTH	CA
—	661-657	not yet reported which blocks →				CA
—	661-661	not yet reported which blocks →				CA
—	661-663	not yet reported which blocks →	PACIFIC BELL	9740	BKFD SOUTH	CA
—	661-664	not yet reported which blocks →	PACIFIC BELL	9740	BKFD SOUTH	CA
—	661-665	6XXX which blocks →	PACIFIC BELL	9740	BKFD SOUTH	CA
—	661-666	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - CA	649C	SNCA NHCS	CA
—	661-667	2XXX4XXX5XXX8XXX9XXX · 3 holders which blocks →	METROPCS, INC.	5562	MCFARLAND	CA
—	661-668	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	EARLIMART	CA
—	661-670	0–9 XXXall 10 · 6 holders which blocks →	METROPCS NETWORKS, LLC	899D	SNCA NHCS	CA
—	661-673	0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	IP HORIZON LLC	515J	SNCA SGCC	CA
—	661-674	0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	LANCASTER	CA
—	661-675	3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	PLDL PLDL	CA
—	661-678	0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	AT&T - LOCAL	7421	SNCA NHCS	CA
—	661-685	not yet reported which blocks →	T-MOBILE USA, INC.	6529	ARVIN	CA
—	661-689	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	CLFRNHTSPG	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.