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
—	925-301	0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	ANTIOCH	CA
—	925-302	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	BSHP RNCH	CA
—	925-303	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	ANTIOCH	CA
—	925-304	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	CLAYTON	CA
—	925-305	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	CONCORD	CA
—	925-307	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	DUBLN-SNRM	CA
—	925-308	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	ECONTRCOST	CA
—	925-309	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	DANVILLE	CA
—	925-310	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	LAFAYETTE	CA
—	925-311	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	CA
—	925-312	not yet reported which blocks →	SPOK, INC.	6630	ANTIOCH	CA
—	925-313	not yet reported which blocks →	PACIFIC BELL	9740	MARTINEZ	CA
—	925-314	5XXX6XXX which blocks →	PACIFIC BELL	9740	DANVILLE	CA
—	925-315	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	LIVERMORE	CA
—	925-316	0–9 XXXall 10 · 8 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	MARTINEZ	CA
—	925-317	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	ORINDA	CA
—	925-318	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	PITTSBURG	CA
—	925-319	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	T-MOBILE USA, INC.	6529	SUNOL	CA
—	925-323	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	WALNUT CRK	CA
—	925-326	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	CONCORD	CA
—	925-327	9XXX which blocks →	PACIFIC BELL	9740	BSHP RNCH	CA
—	925-328	not yet reported which blocks →	PACIFIC BELL	9740	BSHP RNCH	CA
—	925-333	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	WALNUT CRK	CA
—	925-335	6XXX which blocks →	PACIFIC BELL	9740	MARTINEZ	CA
—	925-340	not yet reported which blocks →	SPOK, INC.	6630	WALNUT CRK	CA
—	925-342	0–9 XXXall 10 · 4 holders which blocks →	COMMIO, LLC	939H	WALNUT CRK	CA
—	925-343	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	6906	PLEASANTON	CA
—	925-344	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	LIVERMORE	CA
—	925-345	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	DANVILLE	CA
—	925-346	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	CONCORD	CA
—	925-347	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	LIVERMORE	CA
—	925-349	8XXX which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7145	CONCORD	CA
—	925-351	0XXX1XXX2XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	PLEASANTON	CA
—	925-352	0XXX1XXX2XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	PLEASANTON	CA
—	925-355	5XXX6XXX · 2 holders which blocks →	PACIFIC BELL	9740	BSHP RNCH	CA
—	925-356	1XXX which blocks →	PACIFIC BELL	9740	CONCORD	CA
—	925-358	not yet reported which blocks →	PACIFIC BELL	9740	BSHP RNCH	CA
—	925-359	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	BSHP RNCH	CA
—	925-360	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	WALNUT CRK	CA
—	925-361	2XXX3XXX6XXX · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7145	DUBLN-SNRM	CA
—	925-362	3XXX which blocks →	PACIFIC BELL	9740	DANVILLE	CA
—	925-363	not yet reported which blocks →	PACIFIC BELL	9740	CONCORD	CA
—	925-364	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7240	DUBLN-SNRM	CA
—	925-365	4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7145	BSHP RNCH	CA
—	925-366	0XXX1XXX2XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	PLEASANTON	CA
—	925-367	0XXX1XXX2XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	PLEASANTON	CA
—	925-368	0XXX1XXX2XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	PLEASANTON	CA
—	925-369	4XXX8XXX9XXX · 2 holders which blocks →	MATRIX TELECOM, LLC. S/I/I TNCI - CA	7379	MARTINEZ	CA
—	925-370	not yet reported which blocks →	PACIFIC BELL	9740	MARTINEZ	CA
—	925-371	9XXX which blocks →	PACIFIC BELL	9740	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.