NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

375 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/30/2026

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
— 603-491 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
— 603-550 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H DOVER NH
— 603-551 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 MANCHESTER NH
— 603-552 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 7778 DERRY NH

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.