Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 508

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 1

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
—	508-305	2XXX5XXX · 2 holders which blocks →	TC SYSTEMS, INC.	7135	MARLBORO	MA
—	508-306	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	HOLLISTON	MA
—	508-307	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	TAUNTON	MA
—	508-309	0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	TC SYSTEMS, INC.	7135	FRAMINGHAM	MA
—	508-310	2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	NATICK	MA
—	508-311	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MA
—	508-312	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FRAMINGHAM	MA
—	508-313	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	BROCKTON	MA
—	508-314	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	NATICK	MA
—	508-315	1XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks →	RCN TELECOM SERVICES, INC. - MA	7619	NATICK	MA
—	508-316	2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	NO ATTLEBO	MA
—	508-317	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	WAREHAM	MA
—	508-318	1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	NATICK	MA
—	508-319	1XXX9XXX which blocks →	PAETEC ITEL, LLC	829J	NATICK	MA
—	508-320	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	GRAFTON	MA
—	508-321	3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	MEDWAY	MA
—	508-323	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FRAMINGHAM	MA
—	508-324	none assigned yet which blocks →	VERIZON NEW ENGLAND INC.	9102	FALL RIVER	MA
—	508-325	9XXX which blocks →	VERIZON NEW ENGLAND INC.	9102	NANTUCKET	MA
—	508-326	none assigned yet which blocks →	METROPCS, INC.	5562	BROCKTON	MA
—	508-327	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	AUBURN	MA
—	508-328	none assigned yet which blocks →	METROPCS, INC.	5562	HOPKINTON	MA
—	508-329	1XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	WESTBORO	MA
—	508-330	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	WESTBORO	MA
—	508-331	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	FITCHBURG	MA
—	508-332	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	NANTUCKET	MA
—	508-333	not yet reported which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	NATICK	MA
—	508-334	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	WORCESTER	MA
—	508-335	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	WORCESTER	MA
—	508-336	1XXX which blocks →	VERIZON NEW ENGLAND INC.	9102	SEEKONK	MA
—	508-337	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	MANSFIELD	MA
—	508-338	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	VINEYRDHVN	MA
—	508-339	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	MANSFIELD	MA
—	508-341	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	E DOUGLAS	MA
—	508-342	5XXX8XXX which blocks →	PAETEC ITEL, LLC	829J	ATTLEBORO	MA
—	508-343	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 7 holders which blocks →	TC SYSTEMS, INC.	7135	SEEKONK	MA
—	508-344	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	STURBRIDGE	MA
—	508-345	not yet reported which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROCKTON	MA
—	508-346	2XXX6XXX · 2 holders which blocks →	TC SYSTEMS, INC.	7135	FRANKLIN	MA
—	508-347	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	STURBRIDGE	MA
—	508-348	0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks →	COMCAST IP PHONE, LLC	318J	CHATHAM	MA
—	508-349	4XXX5XXX · 2 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	WELLFLEET	MA
—	508-350	1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	EBRIDGEWTR	MA
—	508-351	0XXX which blocks →	VERIZON NEW ENGLAND INC.	9102	NORTHBORO	MA
—	508-352	not yet reported which blocks →	NORFOLK COUNTY INTERNET, INC.	6083	WORCESTER	MA
—	508-353	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	WORCESTER	MA
—	508-354	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FRAMINGHAM	MA
—	508-355	3XXX7XXX9XXX · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	MARION	MA
—	508-356	3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	PAETEC ITEL, LLC	829J	CATAUMET	MA
—	508-357	none assigned yet which blocks →	VERIZON NEW ENGLAND INC.	9102	MARLBORO	MA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.