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 631
VERIZON NEW YORK, INC. 230
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 64
OMNIPOINT COMMUNICATIONS, INC. - NY 55
CABLEVISION LIGHTPATH, INC. - NY 55
LEVEL 3 COMMUNICATIONS, LLC - NY 53
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
— 631-468 6XXX7XXX8XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-470 none assigned yet which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 HUNTINGTON NY
— 631-471 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-472 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BAYPORT NY
— 631-473 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 PTJEFFERSN NY
— 631-474 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 PTJEFFERSN NY
— 631-475 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 PATCHOGUE NY
— 631-476 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 PTJEFFERSN NY
— 631-477 5XXX6XXX7XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 GREENPORT NY
— 631-478 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 BRENTWOOD NY
— 631-479 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 HUNTINGTON NY
— 631-481 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 ISLIP NY
— 631-485 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 MIDLAND NY
— 631-486 0XXX2XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 W COMMACK NY
— 631-489 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 W COMMACK NY
— 631-491 2XXX which blocks → VERIZON NEW YORK, INC. 9104 MIDLAND NY
— 631-492 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 DEER PARK NY
— 631-493 7XXX8XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 W COMMACK NY
— 631-495 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
— 631-498 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J COLDSPGHBR NY
— 631-499 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 W COMMACK NY
— 631-500 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC- NY 384C WATER MILL NY
— 631-501 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-503 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 CTRMORICHS NY
— 631-506 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 RIVERHEAD NY
— 631-510 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 MIDLAND NY
— 631-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 631-513 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 BRENTWOOD NY
— 631-514 1XXX4XXX5XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 BRENTWOOD NY
— 631-517 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 BABYLON NY
— 631-520 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 AMITYVILLE NY
— 631-521 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 TELECOM OF NEW YORK, LP - NY 8473 BRENTWOOD NY
— 631-523 0XXX which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 CENTRAISLP NY
— 631-528 1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 KINGS PARK NY
— 631-529 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC- NY 384C ORIENT NY
— 631-531 2XXX which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-532 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J AMITYVILLE NY
— 631-534 1XXX2XXX3XXX7XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 COLDSPGHBR NY
— 631-536 3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 EASTPORT NY
— 631-537 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BRIDGEMPTN NY
— 631-538 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SELDEN NY
— 631-539 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 BABYLON NY
— 631-541 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN09 NY
— 631-543 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 COMMACK NY
— 631-544 1XXX2XXX7XXX8XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 KINGS PARK NY
— 631-546 0XXX1XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 HUNTINGTON NY
— 631-547 2XXX3XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-548 1XXX5XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 RIVERHEAD NY
— 631-549 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-551 1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 ST JAMES NY

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.