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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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 603-343 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J DOVER NH
— 603-344 none assigned yet which blocks → UNITED STATES CELLULAR - NH 6290 SUNCOOK NH
— 603-345 none assigned yet which blocks → UNITED STATES CELLULAR - NH 6290 MERRIMACK NH
— 603-346 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → HD CARRIER LLC 321J PLYMOUTH NH
— 603-347 0XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J KINGSTON NH
— 603-348 0XXX1XXX2XXX3XXX4XXX5XXX which blocks → UNITED STATES CELLULAR - NH 6290 NOWOODSTOK NH
— 603-349 0XXX1XXX3XXX8XXX9XXX · 2 holders which blocks → UNITED STATES CELLULAR - NH 6290 W LEBANON NH
— 603-350 0XXX4XXX5XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 7778 MILTON NH
— 603-351 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH 7778 GOFFSTOWN NH
— 603-352 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 KEENE NH
— 603-353 0XXX3XXX5XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 ORFORD NH
— 603-354 0XXX1XXX3XXX8XXX9XXX · 5 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 KEENE NH
— 603-355 none assigned yet which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 KEENE NH
— 603-356 1XXX which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 NO CONWAY NH
— 603-357 none assigned yet which blocks → FIDIUM ENTERPRISE SERVICES, LLC 383J KEENE NH
— 603-358 not yet reported which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 KEENE NH
— 603-359 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 LEBANON NH
— 603-362 0XXX1XXX2XXX3XXX7XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 HAMPSTEAD NH
— 603-363 1XXX3XXX5XXX · 3 holders which blocks → CONSOLIDATED COMM OF NO. NEW ENGLAND-NH 5113 SPOFFORD NH
— 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

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.