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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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 5XXX8XXX · 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

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.