NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
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 ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 603-278 not yet reported which blocks → BRETTON WOODS TEL. CO. 0038 BRETTON WD NH
— 603-279 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 MEREDITH NH
— 603-280 0XXX1XXX3XXX6XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NH 4017 BARRINGTON NH
— 603-281 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 NASHUA NH
— 603-282 1XXX2XXX4XXX6XXX7XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 7778 CANAAN NH
— 603-283 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J KEENE NH
— 603-284 2XXX4XXX · 2 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 CTRSANDWIH NH
— 603-285 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 7778 DOVER NH
— 603-286 0XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 TILTON NH
— 603-287 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NH 4017 CLAREMONT NH
— 603-289 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANCHESTER NH
— 603-290 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - NH 6290 CONCORD NH
— 603-292 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J NEWMARKET NH
— 603-293 3XXX5XXX6XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 LACONIA NH
— 603-294 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NH 4017 PORTSMOUTH NH
— 603-296 3XXX5XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J MANCHESTER NH
— 603-297 none assigned yet which blocks → FREEDOM RING COMMUNICATIONS, LLC 8468 CTROSSIPEE NH
— 603-298 none assigned yet which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 W LEBANON NH
— 603-304 0XXX2XXX3XXX4XXX · 4 holders which blocks → UNITED STATES CELLULAR - NH 6290 ENFIELD NH
— 603-310 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J BEDFORD NH
— 603-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NH
— 603-312 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 DOVER NH
— 603-313 none assigned yet which blocks → UNITED STATES CELLULAR - NH 6290 KEENE NH
— 603-314 3XXX8XXX which blocks → PAETEC ITEL, LLC 829J MANCHESTER NH
— 603-315 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 MANCHESTER NH
— 603-317 1XXX2XXX4XXX5XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 7778 MILAN NH
— 603-318 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 NASHUA NH
— 603-319 1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J PORTSMOUTH NH
— 603-320 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NASHUA NH
— 603-321 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 NASHUA NH
— 603-322 0XXX1XXX4XXX5XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 W LEBANON NH
— 603-323 0XXX4XXX5XXX6XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 TAMWORTH NH
— 603-324 5XXX7XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NASHUA NH
— 603-325 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 7778 NEW BOSTON NH
— 603-326 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NH 4017 BERLIN NH
— 603-327 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J SALEM NH
— 603-328 0XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J SALEM NH
— 603-329 1XXX2XXX3XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 HAMPSTEAD NH
— 603-330 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 ROCHESTER NH
— 603-331 0XXX1XXX2XXX3XXX5XXX6XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NH 4017 COLEBROOK NH
— 603-332 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 ROCHESTER NH
— 603-333 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF NEW HAMPSHIRE, LLC - NH 927H CONCORD NH
— 603-334 1XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 PORTSMOUTH NH
— 603-335 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 ROCHESTER NH
— 603-336 1XXX2XXX3XXX6XXX8XXX · 5 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 HINSDALE NH
— 603-337 5XXX7XXX8XXX · 2 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 ROCHESTER NH
— 603-338 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 7778 KEENE NH
— 603-339 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DERRY NH
— 603-341 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → UNITED STATES CELLULAR - NH 6290 MERRIMACK NH
— 603-342 0XXX5XXX6XXX9XXX · 4 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 BERLIN NH

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.