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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 603-432 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 DERRY NH
— 603-433 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 PORTSMOUTH NH
— 603-434 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 DERRY NH
— 603-435 0XXX1XXX2XXX3XXX4XXX · 5 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 PITTSFIELD NH
— 603-436 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 PORTSMOUTH NH
— 603-437 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 DERRY NH
— 603-438 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 NASHUA NH
— 603-439 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J KEENE NH
— 603-440 0XXX1XXX3XXX4XXX5XXX8XXX9XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 MERRIMACK NH
— 603-442 4XXX5XXX6XXX · 2 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 LEBANON NH
— 603-443 none assigned yet which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 LEBANON NH
— 603-444 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 LITTLETON NH
— 603-445 0XXX4XXX6XXX7XXX · 4 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 NO WALPOLE NH
— 603-446 1XXX6XXX8XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 MARLOW NH
— 603-447 0XXX7XXX9XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CONWAY NH
— 603-448 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 LEBANON NH
— 603-449 4XXX6XXX9XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 MILAN NH
— 603-452 2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → FREEDOM RING COMMUNICATIONS, LLC 8468 CONWAY NH
— 603-453 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → AT&T - LOCAL 7421 HAMPSTEAD NH
— 603-454 9XXX which blocks → UNITED STATES CELLULAR - NH 6290 SUNAPEE NH
— 603-455 none assigned yet which blocks → UNITED STATES CELLULAR - NH 6290 LACONIA NH
— 603-456 1XXX4XXX5XXX8XXX9XXX which blocks → MERRIMACK COUNTY TEL. CO. 0047 WARNER NH
— 603-458 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J SALEM NH
— 603-459 3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J NASHUA NH
— 603-460 2XXX4XXX5XXX7XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 7778 DEERFIELD NH
— 603-461 0XXX1XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → UNITED STATES CELLULAR - NH 6290 MERRIMACK NH
— 603-462 3XXX which blocks → FREEDOM RING COMMUNICATIONS, LLC 8468 DEERFIELD NH
— 603-463 0XXX1XXX4XXX6XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 DEERFIELD NH
— 603-464 9XXX which blocks → MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 3320 HILLSBORO NH
— 603-465 1XXX4XXX5XXX8XXX · 2 holders which blocks → HOLLIS TELEPHONE COMPANY, INC. 3321 HOLLIS NH
— 603-466 1XXX4XXX7XXX8XXX · 4 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 GORHAM NH
— 603-467 1XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → WAVENATION, LLC 700J MANCHESTER NH
— 603-468 0XXX2XXX9XXX · 3 holders which blocks → FREEDOM RING COMMUNICATIONS, LLC 8468 SEABROOK NH
— 603-469 9XXX which blocks → KEARSARGE TEL. CO. 0045 MERIDEN NH
— 603-471 3XXX5XXX · 2 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 BEDFORD NH
— 603-472 0XXX1XXX · 2 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 BEDFORD NH
— 603-473 1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 MILTON ML NH
— 603-474 4XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 SEABROOK NH
— 603-475 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 SALEM NH
— 603-476 3XXX4XXX7XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CTRSANDWIH NH
— 603-477 none assigned yet which blocks → UNITED STATES CELLULAR - NH 6290 CLAREMONT NH
— 603-478 not yet reported which blocks → GRANITE STATE TEL., INC. 0039 HLLSBUPVLG NH
— 603-479 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DERRY NH
— 603-480 not yet reported which blocks → BANDWIDTH.COM CLEC, LLC - NH 996E MANCHESTER NH
— 603-481 3XXX5XXX7XXX8XXX · 3 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 PLYMOUTH NH
— 603-482 6XXX7XXX9XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 ERROL NH
— 603-483 3XXX4XXX6XXX7XXX9XXX · 5 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CANDIA NH
— 603-485 0XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 SUNCOOK NH
— 603-486 0XXX1XXX · 2 holders which blocks → UNITED STATES CELLULAR - NH 6290 MANCHESTER NH
— 603-487 0XXX1XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 NEW BOSTON 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.