NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 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, 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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2001-08-21 603-305 6XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 NASHUA NH
2001-08-21 603-540 3XXX4XXX6XXX7XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 MANCHESTER NH
2001-08-08 603-508 2XXX3XXX4XXX5XXX6XXX · 5 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 PELHAM NH
2001-07-11 603-217 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 BRISTOL NH
2001-07-11 603-301 0XXX1XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NH 4017 CTROSSIPEE NH
2001-05-21 603-541 4XXX7XXX8XXX9XXX · 4 holders which blocks → FIDIUM ENTERPRISE SERVICES, LLC 383J MANCHESTER NH
2001-05-18 603-361 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 MANCHESTER NH
2001-05-04 603-365 2XXX3XXX4XXX which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 MERRIMACK NH
2001-05-04 603-393 0XXX1XXX2XXX3XXX4XXX which blocks → UNITED STATES CELLULAR - NH 6290 LACONIA NH
2001-05-03 603-231 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 DERRY NH
2001-05-03 603-234 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 DERRY NH
2001-05-03 603-235 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 DERRY NH
2001-04-26 603-295 not yet reported which blocks → PAETEC ITEL, LLC 829J DURHAM NH
2001-04-26 603-862 not yet reported which blocks → PAETEC ITEL, LLC 829J DURHAM NH
2001-04-19 603-470 0XXX1XXX2XXX · 2 holders which blocks → UNITED STATES CELLULAR - NH 6290 CONCORD NH
2001-03-22 603-252 none assigned yet which blocks → UNITED STATES CELLULAR - NH 6290 W LEBANON NH
2001-03-16 603-801 5XXX6XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 MILFORD NH
2001-03-16 603-978 7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DOVER NH
2001-03-09 603-303 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 RAYMOND NH
2001-02-14 603-219 0XXX2XXX5XXX7XXX8XXX · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CONCORD NH
2001-02-12 603-340 6XXX7XXX8XXX9XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 SUNCOOK NH
— 603-201 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 XXXXXXXXXX NH
— 603-204 0XXX1XXX2XXX3XXX4XXX5XXX · 4 holders which blocks → UNITED STATES CELLULAR - NH 6290 NASHUA NH
— 603-205 7XXX8XXX · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 PORTSMOUTH NH
— 603-206 0XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J MANCHESTER NH
— 603-208 0XXX1XXX2XXX3XXX · 3 holders which blocks → UNITED STATES CELLULAR - NH 6290 LYME NH
— 603-209 none assigned yet which blocks → UNITED STATES CELLULAR - NH 6290 KEENE NH
— 603-210 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J SUNCOOK NH
— 603-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NH
— 603-212 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 SALEM NH
— 603-214 3XXX which blocks → FREEDOM RING COMMUNICATIONS, LLC 8468 ERROL NH
— 603-215 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FREEDOM RING COMMUNICATIONS, LLC 8468 BERLIN NH
— 603-216 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J DERRY NH
— 603-218 3XXX4XXX7XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J MANCHESTER NH
— 603-220 not yet reported which blocks → XXXXXXXXXX NH
— 603-221 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 NASHUA NH
— 603-222 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 MANCHESTER NH
— 603-223 7XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CONCORD NH
— 603-224 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CONCORD NH
— 603-225 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CONCORD NH
— 603-226 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CONCORD NH
— 603-227 6XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CONCORD NH
— 603-228 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CONCORD NH
— 603-229 2XXX8XXX9XXX · 2 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CONCORD NH
— 603-230 0XXX2XXX8XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CONCORD NH
— 603-232 0XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J MANCHESTER NH
— 603-233 7XXX which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 NASHUA NH
— 603-236 0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CAMPTON NH
— 603-237 1XXX2XXX7XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 COLEBROOK NH
— 603-238 0XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J PLYMOUTH NH

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.