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
— 631-635 0–9 XXXall 10 · 5 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 BABYLON NY
— 631-639 0–9 XXXall 10 · 2 holders which blocks → TC SYSTEMS, INC. - NY 7140 BRENTWOOD NY
— 631-641 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E WATER MILL NY
— 631-642 6XXX7XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 PTJEFFERSN NY
— 631-643 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 MIDLAND NY
— 631-645 not yet reported which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 BRENTWOOD NY
— 631-647 0XXX1XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 BAY SHORE NY
— 631-648 0XXX3XXX7XXX8XXX9XXX which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 RONKONKOMA NY
— 631-649 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 BABYLON NY
— 631-650 none assigned yet which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 ISLIP NY
— 631-651 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CSC VOICE, LLC 612K NORTHPORT NY
— 631-653 0XXX1XXX2XXX7XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 QUOGUE NY
— 631-654 6XXX which blocks → VERIZON NEW YORK, INC. 9104 PATCHOGUE NY
— 631-655 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. - NY 7140 RIVERHEAD NY
— 631-656 0XXX5XXX6XXX8XXX which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 SMITHTOWN NY
— 631-657 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ATLANTIC NY
— 631-659 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 COLDSPGHBR NY
— 631-660 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 RIVERHEAD NY
— 631-661 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BABYLON NY
— 631-663 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 KINGS PARK NY
— 631-664 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 CENTRAISLP NY
— 631-665 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BAY SHORE NY
— 631-666 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BAY SHORE NY
— 631-667 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 DEER PARK NY
— 631-668 8XXX which blocks → VERIZON NEW YORK, INC. 9104 MONTAUK PT NY
— 631-669 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BABYLON NY
— 631-670 0XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 COMMACK NY
— 631-673 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-674 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 MIDLAND NY
— 631-675 none assigned yet which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 STONYBROOK NY
— 631-677 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 SAYVILLE NY
— 631-678 1XXX2XXX3XXX5XXX6XXX7XXX8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 BRENTWOOD NY
— 631-679 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN09 NY
— 631-683 3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 HUNTINGTON NY
— 631-685 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → ONVOY, LLC- NY 384C HAMPTNBAYS NY
— 631-686 0XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 ST JAMES NY
— 631-687 0XXX7XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 PATCHOGUE NY
— 631-688 0XXX2XXX which blocks → TC SYSTEMS, INC. - NY 7140 FARMINGDL NY
— 631-689 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 STONYBROOK NY
— 631-691 8XXX9XXX which blocks → VERIZON NEW YORK, INC. 9104 AMITYVILLE NY
— 631-692 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 COLDSPGHBR NY
— 631-693 1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 AMITYVILLE NY
— 631-694 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-695 not yet reported which blocks → SPOK, INC. 6630 BRENTWOOD NY
— 631-696 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SELDEN NY
— 631-698 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SELDEN NY
— 631-699 1XXX2XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 SAYVILLE NY
— 631-700 not yet reported which blocks → NY
— 631-701 1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 EASTPORT NY
— 631-702 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SOUTHAMPTN 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.