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
—	661-864	5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-867	5XXX which blocks →	PACIFIC BELL	9740	WALKERBSIN	CA
—	661-868	9XXX which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-869	0XXX4XXX5XXX7XXX which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-871	not yet reported which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-872	not yet reported which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-873	3XXX4XXX5XXX · 3 holders which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-874	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	LANCASTER	CA
—	661-877	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	SNCA NHCS	CA
—	661-878	7XXX8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PLDL PLDL	CA
—	661-885	3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	ONVOY, LLC - CA	649C	BKFD SOUTH	CA
—	661-888	0–9 XXXall 10 · 8 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	SNCA NHCS	CA
—	661-889	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks →	AT&T - LOCAL	7421	BKFD MAIN	CA
—	661-900	none assigned yet which blocks →	METROPCS, INC.	5562	BKFD MAIN	CA
—	661-902	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	LANCASTER	CA
—	661-903	3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	ARVIN	CA
—	661-904	7XXX8XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	SNCA NHCS	CA
—	661-909	not yet reported which blocks →				CA
—	661-910	4XXX5XXX7XXX8XXX9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SHAFTER	CA
—	661-911	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	CA
—	661-912	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	BKFD MAIN	CA
—	661-916	0XXX6XXX7XXX8XXX9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LANCASTER	CA
—	661-917	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LANCASTER	CA
—	661-918	not yet reported which blocks →	33 WIRELESS INC.	6967	PLDL PLDL	CA
—	661-925	not yet reported which blocks →				CA
—	661-927	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	MCFARLAND	CA
—	661-932	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	BKFD MAIN	CA
—	661-940	not yet reported which blocks →	FRONTIER CALIFORNIA INC.	2319	LANCASTER	CA
—	661-942	not yet reported which blocks →	FRONTIER CALIFORNIA INC.	2319	LANCASTER	CA
—	661-943	not yet reported which blocks →	FRONTIER CALIFORNIA INC.	2319	LANCASTER	CA
—	661-944	7XXX which blocks →	PACIFIC BELL	9740	PLDL PLDL	CA
—	661-945	not yet reported which blocks →	FRONTIER CALIFORNIA INC.	2319	LANCASTER	CA
—	661-946	not yet reported which blocks →	FRONTIER CALIFORNIA INC.	2319	LANCASTER	CA
—	661-947	not yet reported which blocks →	PACIFIC BELL	9740	PLDL PLDL	CA
—	661-948	not yet reported which blocks →	FRONTIER CALIFORNIA INC.	2319	LANCASTER	CA
—	661-949	4XXX which blocks →	FRONTIER CALIFORNIA INC.	2319	LANCASTER	CA
—	661-950	not yet reported which blocks →				CA
—	661-951	not yet reported which blocks →	FRONTIER CALIFORNIA INC.	2319	LANCASTER	CA
—	661-952	4XXX6XXX7XXX8XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	LANCASTER	CA
—	661-958	not yet reported which blocks →				CA
—	661-959	not yet reported which blocks →				CA
—	661-964	0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	SNCA NHCS	CA
—	661-965	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PLDL PLDL	CA
—	661-966	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	PLDL PLDL	CA
—	661-972	3XXX9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	TEHACHAPI	CA
—	661-974	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks →	PACIFIC BELL (COMPETITIVE)	7480	LANCASTER	CA
—	661-976	not yet reported which blocks →				CA
—	661-977	1XXX2XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	SNCA SGCC	CA
—	661-978	none assigned yet which blocks →	METROPCS, INC.	5562	BKFD MAIN	CA
—	661-979	4XXX which blocks →	METROPCS, INC.	5562	BKFD MAIN	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.