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
Download CSV ↓
Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 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

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.