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
— 603-488 0XXX6XXX7XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J BEDFORD NH
— 603-489 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J HAMPSTEAD NH
— 603-490 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 DERRY NH
— 603-491 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 CONCORD NH
— 603-492 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 MANCHESTER NH
— 603-493 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 MERRIMACK NH
— 603-494 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 MERRIMACK NH
— 603-495 not yet reported which blocks → GRANITE STATE TEL., INC. 0039 WASHINGTON NH
— 603-496 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 CONCORD NH
— 603-497 0XXX1XXX7XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 GOFFSTOWN NH
— 603-498 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 PORTSMOUTH NH
— 603-499 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NH 4017 KEENE NH
— 603-501 0XXX1XXX2XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J PORTSMOUTH NH
— 603-502 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PORTSMOUTH NH
— 603-503 0XXX2XXX4XXX5XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 7778 LANCASTER NH
— 603-504 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - NH 6290 CLAREMONT NH
— 603-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NH
— 603-512 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 MANCHESTER NH
— 603-513 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 CONCORD NH
— 603-515 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 WOLFEBORO NH
— 603-516 not yet reported which blocks → FREEDOM RING COMMUNICATIONS, LLC 8468 DOVER NH
— 603-517 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 MERRIMACK NH
— 603-518 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → AT&T - LOCAL 7421 MANCHESTER NH
— 603-520 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 LACONIA NH
— 603-521 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → AT&T - LOCAL 7421 NASHUA NH
— 603-522 1XXX2XXX4XXX7XXX · 4 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 SANBORNVL NH
— 603-523 2XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CANAAN NH
— 603-524 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 LACONIA NH
— 603-525 6XXX7XXX8XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 HANCOCK NH
— 603-526 not yet reported which blocks → KEARSARGE TEL. CO. 0045 NEW LONDON NH
— 603-527 8XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 LACONIA NH
— 603-528 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 LACONIA NH
— 603-529 not yet reported which blocks → GRANITE STATE TEL., INC. 0039 WEARE NH
— 603-531 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PORTSMOUTH NH
— 603-532 0XXX3XXX · 2 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 JAFFREY NH
— 603-533 none assigned yet which blocks → UNITED STATES CELLULAR - NH 6290 MERRIMACK NH
— 603-534 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 DOVER NH
— 603-535 not yet reported which blocks → PAETEC ITEL, LLC 829J PLYMOUTH NH
— 603-536 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 PLYMOUTH NH
— 603-537 4XXX6XXX8XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 DERRY NH
— 603-538 0XXX3XXX · 2 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 PITTSBURG NH
— 603-539 none assigned yet which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CTROSSIPEE NH
— 603-542 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CLAREMONT NH
— 603-543 none assigned yet which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CLAREMONT NH
— 603-544 4XXX5XXX · 2 holders which blocks → MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 3320 MELVIN VLG NH
— 603-545 1XXX2XXX4XXX5XXX7XXX8XXX9XXX which blocks → PAETEC ITEL, LLC 829J CONCORD NH
— 603-546 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J NASHUA NH
— 603-547 0XXX1XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 GREENFIELD NH
— 603-548 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 DERRY NH
— 603-549 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 DERRY 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.