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
—	661-298	6XXX which blocks →	PACIFIC BELL	9740	SNCA SGCC	CA
—	661-299	7XXX8XXX · 2 holders which blocks →	PACIFIC BELL	9740	SNCA SGCC	CA
—	661-301	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BKFD MAIN	CA
—	661-303	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BKFD MAIN	CA
—	661-304	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BKFD MAIN	CA
—	661-305	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	PLDL PLDL	CA
—	661-306	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	LAKEHUGHES	CA
—	661-307	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	BKFD MAIN	CA
—	661-309	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7240	SNCA SGCC	CA
—	661-310	4XXX5XXX6XXX8XXX · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	SNCA NHCS	CA
—	661-311	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	CA
—	661-312	none assigned yet which blocks →	METROPCS NETWORKS, LLC	899D	SNCA NHCS	CA
—	661-313	none assigned yet which blocks →	METROPCS NETWORKS, LLC	899D	SNCA SGCC	CA
—	661-316	2XXX5XXX7XXX8XXX9XXX · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7128	BKFD MAIN	CA
—	661-318	not yet reported which blocks →	33 WIRELESS INC.	6967	BKFD MAIN	CA
—	661-319	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BKFD MAIN	CA
—	661-320	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	LEBEC	CA
—	661-321	6XXX which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-322	not yet reported which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-323	not yet reported which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-324	not yet reported which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-325	not yet reported which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-326	not yet reported which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-327	not yet reported which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-328	not yet reported which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-329	not yet reported which blocks →	SPOK, INC.	6630	BKFD MAIN	CA
—	661-330	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BKFD MAIN	CA
—	661-331	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BKFD MAIN	CA
—	661-332	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BKFD MAIN	CA
—	661-333	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BKFD MAIN	CA
—	661-334	0XXX which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-335	1XXX2XXX which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-336	1XXX2XXX4XXX8XXX9XXX · 4 holders which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-337	0XXX1XXX2XXX4XXX5XXX8XXX9XXX · 2 holders which blocks →	PACIFIC BELL	9740	BKFD MAIN	CA
—	661-338	1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	LAKEHUGHES	CA
—	661-339	1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	HI VISTA	CA
—	661-341	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	AT&T - LOCAL	7421	LANCASTER	CA
—	661-342	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	BKFD MAIN	CA
—	661-344	1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks →	METROPCS, INC.	5562	EARLIMART	CA
—	661-345	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BKFD MAIN	CA
—	661-351	0XXX1XXX which blocks →	UTILITY TELECOM GROUP, LLC - CA	9262	LAKEHUGHES	CA
—	661-352	0XXX1XXX2XXX3XXX4XXX5XXX6XXX which blocks →	UTILITY TELECOM GROUP, LLC - CA	9262	EDWARDS	CA
—	661-353	0XXX1XXX which blocks →	UTILITY TELECOM GROUP, LLC - CA	9262	LANCASTER	CA
—	661-354	0XXX1XXX2XXX3XXX4XXX5XXX6XXX which blocks →	UTILITY TELECOM GROUP, LLC - CA	9262	BKFD MAIN	CA
—	661-355	1XXX2XXX3XXX4XXX5XXX6XXX which blocks →	UTILITY TELECOM GROUP, LLC - CA	9262	ROSAMOND	CA
—	661-356	0XXX1XXX2XXX3XXX4XXX5XXX6XXX which blocks →	UTILITY TELECOM GROUP, LLC - CA	9262	MOJAVE	CA
—	661-357	0XXX1XXX2XXX3XXX4XXX5XXX6XXX which blocks →	UTILITY TELECOM GROUP, LLC - CA	9262	TEHACHAPI	CA
—	661-358	0XXX2XXX3XXX4XXX5XXX6XXX7XXX which blocks →	UTILITY TELECOM GROUP, LLC - CA	9262	TAFT	CA
—	661-359	0XXX1XXX2XXX3XXX4XXX5XXX6XXX which blocks →	UTILITY TELECOM GROUP, LLC - CA	9262	DELANO	CA
—	661-361	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	PAETEC ITEL, LLC	829J	PLDL PLDL	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.