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
—	508-463	3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	ATTLEBORO	MA
—	508-464	2XXX7XXX9XXX · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	UPTON	MA
—	508-466	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	ONVOY, LLC - MA	892D	NORTHBORO	MA
—	508-467	not yet reported which blocks →	TC SYSTEMS, INC.	7135	MARLBORO	MA
—	508-468	0–9 XXXall 10 · 3 holders which blocks →	TC SYSTEMS, INC.	7135	BROCKTON	MA
—	508-469	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	PAETEC ITEL, LLC	829J	CHATHAM	MA
—	508-470	1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MA	990E	DENNIS	MA
—	508-471	0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	PAETEC ITEL, LLC	829J	WORCESTER	MA
—	508-472	0XXX which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	WALPOLE	MA
—	508-473	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	MILFORD	MA
—	508-474	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	PAETEC ITEL, LLC	829J	HOLLISTON	MA
—	508-475	0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	WESTBORO	MA
—	508-476	0XXX5XXX6XXX8XXX · 4 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	E DOUGLAS	MA
—	508-477	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	OSTERVILLE	MA
—	508-478	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	MILFORD	MA
—	508-479	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	DOVER	MA
—	508-480	5XXX which blocks →	VERIZON NEW ENGLAND INC.	9102	MARLBORO	MA
—	508-481	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	MARLBORO	MA
—	508-482	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	MILFORD	MA
—	508-483	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FRAMINGHAM	MA
—	508-484	3XXX5XXX8XXX · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	BROCKTON	MA
—	508-485	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	MARLBORO	MA
—	508-486	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	MARLBORO	MA
—	508-487	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	PROVINCETN	MA
—	508-488	0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	PAETEC ITEL, LLC	829J	MILFORD	MA
—	508-489	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	FRAMINGHAM	MA
—	508-490	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	MARLBORO	MA
—	508-491	1XXX9XXX · 2 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	FALL RIVER	MA
—	508-492	4XXX7XXX8XXX9XXX · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MA	990E	WALPOLE	MA
—	508-493	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	FALL RIVER	MA
—	508-494	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	FRAMINGHAM	MA
—	508-495	3XXX which blocks →	VERIZON NEW ENGLAND INC.	9102	FALMOUTH	MA
—	508-496	not yet reported which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	FALL RIVER	MA
—	508-497	not yet reported which blocks →	VERIZON NEW ENGLAND INC.	9102	HOPKINTON	MA
—	508-498	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	MILFORD	MA
—	508-500	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	MARION	MA
—	508-501	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks →	TC SYSTEMS, INC.	7135	NEWBEDFORD	MA
—	508-503	1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	PLYMOUTH	MA
—	508-505	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	WALPOLE	MA
—	508-509	none assigned yet which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	ROCHESTER	MA
—	508-510	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks →	RCN TELECOM SERVICES, INC. - MA	7619	BROCKTON	MA
—	508-511	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MA
—	508-512	not yet reported which blocks →				MA
—	508-513	5XXX7XXX8XXX9XXX · 3 holders which blocks →	TC SYSTEMS, INC.	7135	BROCKTON	MA
—	508-514	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	PAETEC ITEL, LLC	829J	WELLFLEET	MA
—	508-515	not yet reported which blocks →				MA
—	508-516	not yet reported which blocks →				MA
—	508-517	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	WESTFORD	MA
—	508-518	not yet reported which blocks →	TC SYSTEMS, INC.	7135	FRAMINGHAM	MA
—	508-519	3XXX9XXX · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	WORCESTER	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.