Recent prefix assignments

0 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, all time — NPA 603

CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 247

BELL ATLANTIC MOBILE, INC 74

PAETEC ITEL, LLC 58

MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 44

COMCAST IP PHONE, LLC 40

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
2016-02-26	603-901	0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH	7778	CONWAY	NH
2016-01-04	603-404	0–9 XXXall 10 · 4 holders which blocks →	BELL ATLANTIC MOBILE, INC	6386	DERRY	NH
2015-12-09	603-408	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BERLIN	NH
2015-10-13	603-409	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	LACONIA	NH
2015-07-28	603-507	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	ROCHESTER	NH
2015-05-21	603-931	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH	7778	CONCORD	NH
2015-05-06	603-407	0XXX8XXX · 2 holders which blocks →	PAETEC ITEL, LLC	829J	BELMONT	NH
2015-04-14	603-417	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	NASHUA	NH
2014-09-30	603-308	0–9 XXXwhole prefix which blocks →	CONSOLIDATED COMM OF NO. NEW ENGLAND-NH	5113	HANOVER	NH
2013-08-09	603-309	0–9 XXXall 10 · 6 holders which blocks →	BELL ATLANTIC MOBILE, INC	6386	NEWPORT	NH
2013-01-04	603-260	0–9 XXXall 10 · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	DERRY	NH
2012-11-08	603-213	0–9 XXXall 10 · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	MILFORD	NH
2012-09-06	603-307	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks →	BELL ATLANTIC MOBILE, INC	6386	NO CONWAY	NH
2012-09-06	603-402	0–9 XXXall 10 · 4 holders which blocks →	BELL ATLANTIC MOBILE, INC	6386	NASHUA	NH
2012-07-19	603-375	0XXX3XXX4XXX · 3 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	ASHLAND	NH
2012-02-28	603-251	0XXX1XXX · 2 holders which blocks →	PAETEC ITEL, LLC	829J	CHARLESTN	NH
2011-08-31	603-400	0–9 XXXall 10 · 3 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	HOLLIS	NH
2011-08-16	603-200	0–9 XXXall 10 · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	NEWMARKET	NH
2011-07-20	603-243	0XXX1XXX6XXX · 3 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	WOODSVILLE	NH
2010-07-30	603-814	0–9 XXXall 10 · 6 holders which blocks →	COMCAST IP PHONE, LLC	318J	SEABROOK	NH
2010-06-11	603-360	1XXX which blocks →	TOPSHAM COMMUNICATIONS, LLC	573F	ORFORD	NH
2010-03-29	603-510	0XXX which blocks →	COMCAST IP PHONE, LLC	318J	MERIDEN	NH
2009-11-23	603-808	0XXX1XXX2XXX8XXX · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	ANTRIM	NH
2009-11-17	603-705	0XXX8XXX9XXX · 2 holders which blocks →	COMCAST IP PHONE, LLC	318J	SALISBURY	NH
2009-11-17	603-877	0XXX1XXX2XXX7XXX8XXX9XXX · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	NEW LONDON	NH
2009-11-17	603-902	0XXX which blocks →	COMCAST IP PHONE, LLC	318J	SUTTON	NH
2009-11-17	603-961	0XXX which blocks →	COMCAST IP PHONE, LLC	318J	CHICHESTER	NH
2009-11-17	603-977	0XXX7XXX8XXX9XXX · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	ANDOVER	NH
2009-11-16	603-840	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	EPSOM	NH
2009-11-16	603-975	0XXX7XXX · 2 holders which blocks →	COMCAST IP PHONE, LLC	318J	BOSCAWEN	NH
2009-10-30	603-813	0XXX1XXX2XXX3XXX5XXX · 4 holders which blocks →	IDT AMERICA, CORP. - NH	314C	CTRBARNSTE	NH
2009-10-30	603-855	2XXX5XXX8XXX · 3 holders which blocks →	IDT AMERICA, CORP. - NH	314C	ALTON	NH
2009-10-30	603-872	2XXX which blocks →	IDT AMERICA, CORP. - NH	314C	GLNTNIRWRS	NH
2009-10-30	603-906	2XXX which blocks →	IDT AMERICA, CORP. - NH	314C	BARNSTEAD	NH
2009-10-22	603-701	1XXX2XXX · 2 holders which blocks →	IDT AMERICA, CORP. - NH	314C	NEW DURHAM	NH
2009-07-06	603-921	0–9 XXXall 10 · 3 holders which blocks →	BELL ATLANTIC MOBILE, INC	6386	NASHUA	NH
2009-05-08	603-718	0–9 XXXall 10 · 4 holders which blocks →	BELL ATLANTIC MOBILE, INC	6386	NASHUA	NH
2008-07-07	603-933	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks →	BELL ATLANTIC MOBILE, INC	6386	GREENFIELD	NH
2008-06-06	603-937	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	BELL ATLANTIC MOBILE, INC	6386	MEREDITH	NH
2008-05-14	603-722	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - NH	996E	MANCHESTER	NH
2008-03-10	603-820	0–9 XXXall 10 · 2 holders which blocks →	METROPCS, INC.	5562	MERRIMACK	NH
2008-02-26	603-948	0–9 XXXall 10 · 7 holders which blocks →	IDT AMERICA, CORP. - NH	314C	ROCHESTER	NH
2008-01-22	603-960	0XXX1XXX2XXX4XXX8XXX9XXX · 3 holders which blocks →	BELL ATLANTIC MOBILE, INC	6386	CAMPTON	NH
2007-12-06	603-815	0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 4 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - NH	8299	DURHAM	NH
2007-08-01	603-945	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - NH	637E	MANCHESTER	NH
2007-03-13	603-809	0–9 XXXall 10 · 3 holders which blocks →	BELL ATLANTIC MOBILE, INC	6386	NASHUA	NH
2006-12-18	603-306	0–9 XXXall 10 · 4 holders which blocks →	FREEDOM RING COMMUNICATIONS, LLC	8468	LEBANON	NH
2006-11-07	603-392	0XXX1XXX2XXX7XXX · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	WINCHESTER	NH
2006-10-26	603-291	0XXX1XXX2XXX3XXX7XXX9XXX · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	GREENVILLE	NH
2006-10-13	603-277	0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	HANOVER	NH

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.