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
—	508-410	not yet reported which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	WORCESTER	MA
—	508-411	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MA
—	508-412	not yet reported which blocks →	NORFOLK COUNTY INTERNET, INC.	6083	WESTBORO	MA
—	508-414	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	WORCESTER	MA
—	508-416	0XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	TC SYSTEMS, INC.	7135	FRAMINGHAM	MA
—	508-417	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	HOPKINTON	MA
—	508-418	1XXX2XXX5XXX6XXX7XXX · 4 holders which blocks →	PAETEC ITEL, LLC	829J	HYANNIS	MA
—	508-419	1XXX5XXX6XXX7XXX9XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	OSTERVILLE	MA
—	508-420	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	OSTERVILLE	MA
—	508-421	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	WORCESTER	MA
—	508-422	0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	MILFORD	MA
—	508-423	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BILLERICA	MA
—	508-424	5XXX8XXX · 2 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	FRAMINGHAM	MA
—	508-425	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks →	RCN TELECOM SERVICES, INC. - MA	7619	WORCESTER	MA
—	508-426	not yet reported which blocks →	BANDWIDTH.COM CLEC, LLC - MA	990E	AUBURN	MA
—	508-427	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	BROCKTON	MA
—	508-428	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	OSTERVILLE	MA
—	508-429	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	HOLLISTON	MA
—	508-430	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	HARWICH	MA
—	508-431	0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	ATTLEBORO	MA
—	508-432	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	HARWICH	MA
—	508-433	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	ONVOY, LLC - MA	892D	NATICK	MA
—	508-434	0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	CHARLTON	MA
—	508-435	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	HOPKINTON	MA
—	508-436	0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks →	PAETEC ITEL, LLC	829J	BROCKTON	MA
—	508-437	2XXX3XXX7XXX9XXX · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	BARNSTABLE	MA
—	508-438	not yet reported which blocks →	PAETEC ITEL, LLC	829J	WORCESTER	MA
—	508-439	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks →	RCN TELECOM SERVICES, INC. - MA	7619	WESTBORO	MA
—	508-440	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks →	RCN TELECOM SERVICES, INC. - MA	7619	FRANKLIN	MA
—	508-441	0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks →	METROPCS, INC.	5562	NEWBEDFORD	MA
—	508-442	not yet reported which blocks →	NORFOLK COUNTY INTERNET, INC.	6083	PLYMOUTH	MA
—	508-443	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	BRIDGEWTR	MA
—	508-444	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	FALMOUTH	MA
—	508-445	1XXX4XXX9XXX · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	CATAUMET	MA
—	508-447	not yet reported which blocks →	NORFOLK COUNTY INTERNET, INC.	6083	FOXBORO	MA
—	508-448	1XXX2XXX3XXX4XXX · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	REHOBOTH	MA
—	508-449	0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	MARLBORO	MA
—	508-450	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	WORCESTER	MA
—	508-451	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	LAWRENCE	MA
—	508-452	2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	PAETEC ITEL, LLC	829J	MANSFIELD	MA
—	508-453	not yet reported which blocks →	PAETEC ITEL, LLC	829J	WORCESTER	MA
—	508-454	8XXX9XXX which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	WALPOLE	MA
—	508-455	3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	ATTLEBORO	MA
—	508-456	0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	COMCAST IP PHONE, LLC	318J	EBRIDGEWTR	MA
—	508-457	8XXX which blocks →	VERIZON NEW ENGLAND INC.	9102	FALMOUTH	MA
—	508-458	3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	MILFORD	MA
—	508-459	0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks →	PAETEC ITEL, LLC	829J	WORCESTER	MA
—	508-460	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	MARLBORO	MA
—	508-461	0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks →	RCN TELECOM SERVICES, INC. - MA	7619	WEBSTER	MA
—	508-462	1XXX2XXX3XXX9XXX · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	CHARLTON	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.