NumberResearch Membership · Data 09/20/2026

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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 603-364 7XXX which blocks → UNION TEL. CO. 0049 GLNTNIRWRS NH
— 603-366 0XXX1XXX3XXX6XXX8XXX · 2 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 LACONIA NH
— 603-367 0XXX1XXX2XXX3XXX7XXX · 5 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 MADISON NH
— 603-369 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NH 4017 CONCORD NH
— 603-371 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J PETERBROGH NH
— 603-372 2XXX3XXX6XXX7XXX8XXX · 3 holders which blocks → FREEDOM RING COMMUNICATIONS, LLC 8468 CLAREMONT NH
— 603-373 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J PORTSMOUTH NH
— 603-374 1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 BARTLETT NH
— 603-376 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 DOVER NH
— 603-377 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 MERRIMACK NH
— 603-378 1XXX3XXX5XXX8XXX · 4 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 PLAISTOW NH
— 603-379 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NH 4017 RYE BEACH NH
— 603-380 7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PORTSMOUTH NH
— 603-381 none assigned yet which blocks → UNITED STATES CELLULAR - NH 6290 W LEBANON NH
— 603-382 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 PLAISTOW NH
— 603-383 1XXX2XXX3XXX5XXX7XXX · 5 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 JACKSON NH
— 603-384 0XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J GOFFSTOWN NH
— 603-385 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 MANCHESTER NH
— 603-386 1XXX4XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J SALEM NH
— 603-387 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 LACONIA NH
— 603-388 3XXX which blocks → FREEDOM RING COMMUNICATIONS, LLC 8468 COLEBROOK NH
— 603-389 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J DURHAM NH
— 603-390 2XXX6XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 7778 JEFFERSON NH
— 603-391 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - NH 8299 MANCHESTER NH
— 603-394 1XXX2XXX3XXX4XXX5XXX6XXX · 4 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 SO HAMPTON NH
— 603-395 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 7778 EXETER NH
— 603-396 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 MERRIMACK NH
— 603-397 0XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J DURHAM NH
— 603-398 none assigned yet which blocks → UNITED STATES CELLULAR - NH 6290 W LEBANON NH
— 603-399 1XXX2XXX3XXX5XXX6XXX · 4 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 WESTMORELD NH
— 603-410 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J CONCORD NH
— 603-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NH
— 603-412 2XXX4XXX6XXX · 3 holders which blocks → UNITED STATES CELLULAR - NH 6290 PLYMOUTH NH
— 603-413 1XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J MANCHESTER NH
— 603-414 0XXX2XXX3XXX5XXX6XXX8XXX · 5 holders which blocks → TDS METROCOM, LLC 520K SUNAPEE NH
— 603-415 not yet reported which blocks → FREEDOM RING COMMUNICATIONS, LLC 8468 CONCORD NH
— 603-418 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J EXETER NH
— 603-419 1XXX2XXX3XXX5XXX which blocks → UNITED STATES CELLULAR - NH 6290 SUNCOOK NH
— 603-420 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 7778 MERRIMACK NH
— 603-421 6XXX7XXX8XXX · 2 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 DERRY NH
— 603-422 2XXX3XXX4XXX5XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 PORTSMOUTH NH
— 603-423 7XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 MERRIMACK NH
— 603-424 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 MERRIMACK NH
— 603-425 8XXX9XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 DERRY NH
— 603-426 1XXX2XXX3XXX4XXX6XXX · 2 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 DERRY NH
— 603-427 8XXX9XXX · 2 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 PORTSMOUTH NH
— 603-428 4XXX9XXX · 2 holders which blocks → MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 3320 HENNIKER NH
— 603-429 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 MERRIMACK NH
— 603-430 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 PORTSMOUTH NH
— 603-431 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 PORTSMOUTH 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.