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
—	508-520	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FRANKLIN	MA
—	508-521	0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	PAETEC ITEL, LLC	829J	BROCKTON	MA
—	508-522	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FRAMINGHAM	MA
—	508-523	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	SHREWSBURY	MA
—	508-524	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	FALMOUTH	MA
—	508-525	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks →	RCN TELECOM SERVICES, INC. - MA	7619	NEWBEDFORD	MA
—	508-526	3XXX9XXX · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	UXBRIDGE	MA
—	508-527	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	PEABODY	MA
—	508-528	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FRANKLIN	MA
—	508-529	0XXX1XXX5XXX7XXX8XXX · 3 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	UPTON	MA
—	508-530	0–9 XXXall 10 · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	FRANKLIN	MA
—	508-531	not yet reported which blocks →	PAETEC ITEL, LLC	829J	BRIDGEWTR	MA
—	508-532	not yet reported which blocks →	PAETEC ITEL, LLC	829J	FRAMINGHAM	MA
—	508-533	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	MEDWAY	MA
—	508-534	3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	HYANNIS	MA
—	508-535	5XXX8XXX · 2 holders which blocks →	PAETEC ITEL, LLC	829J	EASTON	MA
—	508-536	0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	FALL RIVER	MA
—	508-537	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	AUBURN	MA
—	508-538	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks →	PAETEC ITEL, LLC	829J	MARION	MA
—	508-539	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	OSTERVILLE	MA
—	508-540	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FALMOUTH	MA
—	508-541	0XXX which blocks →	VERIZON NEW ENGLAND INC.	9102	FRANKLIN	MA
—	508-542	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	NEWBEDFORD	MA
—	508-543	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FOXBORO	MA
—	508-544	0XXX4XXX7XXX · 3 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	HOPKINTON	MA
—	508-545	3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	NATICK	MA
—	508-546	9XXX which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	FOXBORO	MA
—	508-547	not yet reported which blocks →	NORFOLK COUNTY INTERNET, INC.	6083	FALL RIVER	MA
—	508-548	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FALMOUTH	MA
—	508-549	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FOXBORO	MA
—	508-550	not yet reported which blocks →				MA
—	508-552	1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks →	PAETEC ITEL, LLC	829J	WORCESTER	MA
—	508-553	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FRANKLIN	MA
—	508-554	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	XXXXXXXXXX	MA
—	508-555	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	DIR ASST	MA
—	508-556	2XXX5XXX6XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	WORCESTER	MA
—	508-557	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	COMCAST IP PHONE, LLC	318J	SEEKONK	MA
—	508-558	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	FALL RIVER	MA
—	508-559	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	BROCKTON	MA
—	508-560	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	VINEYRDHVN	MA
—	508-561	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	FRAMINGHAM	MA
—	508-562	0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	BROCKTON	MA
—	508-563	8XXX which blocks →	VERIZON NEW ENGLAND INC.	9102	CATAUMET	MA
—	508-564	none assigned yet which blocks →	VERIZON NEW ENGLAND INC.	9102	CATAUMET	MA
—	508-565	4XXX6XXX8XXX9XXX · 4 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	EASTON	MA
—	508-566	8XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	CATAUMET	MA
—	508-567	2XXX3XXX7XXX8XXX9XXX · 2 holders which blocks →	COMCAST IP PHONE, LLC	318J	FALL RIVER	MA
—	508-568	0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	PAETEC ITEL, LLC	829J	HYANNIS	MA
—	508-569	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	WORCESTER	MA
—	508-571	0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks →	TC SYSTEMS, INC.	7135	NORTHBORO	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.