Recent prefix assignments

1 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 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
—	508-358	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	WAYLAND	MA
—	508-359	3XXX which blocks →	VERIZON NEW ENGLAND INC.	9102	MEDFIELD	MA
—	508-360	none assigned yet which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	HYANNIS	MA
—	508-361	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	FRAMINGHAM	MA
—	508-362	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	BARNSTABLE	MA
—	508-363	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	WORCESTER	MA
—	508-364	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BARNSTABLE	MA
—	508-365	0XXX4XXX7XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	WORCESTER	MA
—	508-366	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	WESTBORO	MA
—	508-367	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BARNSTABLE	MA
—	508-368	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	WORCESTER	MA
—	508-369	8XXX which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	MANSFIELD	MA
—	508-370	2XXX which blocks →	VERIZON NEW ENGLAND INC.	9102	FRAMINGHAM	MA
—	508-371	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	FRAMINGHAM	MA
—	508-373	2XXX3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks →	PAETEC ITEL, LLC	829J	WORCESTER	MA
—	508-374	2XXX3XXX4XXX9XXX · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	NANTUCKET	MA
—	508-375	1XXX3XXX5XXX7XXX8XXX · 3 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	BARNSTABLE	MA
—	508-376	0XXX3XXX7XXX · 3 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	MILLIS	MA
—	508-377	1XXX2XXX3XXX6XXX8XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	MILFORD	MA
—	508-378	none assigned yet which blocks →	VERIZON NEW ENGLAND INC.	9102	EBRIDGEWTR	MA
—	508-379	2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	NO SWANSEA	MA
—	508-380	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	FRAMINGHAM	MA
—	508-381	2XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	MILFORD	MA
—	508-382	2XXX4XXX6XXX · 3 holders which blocks →	TC SYSTEMS, INC.	7135	MARLBORO	MA
—	508-383	3XXX4XXX5XXX · 2 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	FRAMINGHAM	MA
—	508-384	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	WRENTHAM	MA
—	508-385	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	DENNIS	MA
—	508-386	4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	TAUNTON	MA
—	508-387	9XXX which blocks →	VERIZON NEW ENGLAND INC.	9102	FRAMINGHAM	MA
—	508-388	1XXX5XXX6XXX7XXX9XXX · 3 holders which blocks →	ONVOY, LLC - MA	892D	FALMOUTH	MA
—	508-389	3XXX4XXX · 2 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	WESTBORO	MA
—	508-390	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FRAMINGHAM	MA
—	508-391	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FRAMINGHAM	MA
—	508-392	0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks →	RCN TELECOM SERVICES, INC. - MA	7619	CATAUMET	MA
—	508-393	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	NORTHBORO	MA
—	508-394	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	DENNIS	MA
—	508-395	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	FRAMINGHAM	MA
—	508-396	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FRAMINGHAM	MA
—	508-397	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	NATICK	MA
—	508-398	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	DENNIS	MA
—	508-399	0XXX1XXX3XXX4XXX9XXX · 5 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	SOUTHGATE	MA
—	508-400	none assigned yet which blocks →	METROPCS, INC.	5562	HOPKINTON	MA
—	508-402	0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks →	PAETEC ITEL, LLC	829J	FALL RIVER	MA
—	508-403	0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	CATAUMET	MA
—	508-404	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	TC SYSTEMS, INC.	7135	WALPOLE	MA
—	508-405	5XXX6XXX7XXX9XXX · 2 holders which blocks →	RCN TELECOM SERVICES, INC. - MA	7619	FRAMINGHAM	MA
—	508-406	1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	MANSFIELD	MA
—	508-407	5XXX6XXX7XXX8XXX · 3 holders which blocks →	PAETEC ITEL, LLC	829J	AUBURN	MA
—	508-408	3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	BROCKTON	MA
—	508-409	0–9 XXXall 10 · 7 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	ATTLEBORO	MA

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.