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
— 631-706 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 STONYBROOK NY
— 631-708 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
— 631-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 631-712 7XXX8XXX9XXX which blocks → TC SYSTEMS, INC. - NY 7140 FARMINGDL NY
— 631-713 not yet reported which blocks → PAETEC ITEL, LLC 829J EASTPORT NY
— 631-715 0XXX4XXX5XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 CENTRAISLP NY
— 631-716 1XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 SELDEN NY
— 631-719 not yet reported which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 FARMINGDL NY
— 631-721 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 SELDEN NY
— 631-722 1XXX6XXX7XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 JAMESPORT NY
— 631-723 6XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 HAMPTNBAYS NY
— 631-724 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SMITHTOWN NY
— 631-725 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SAG HARBOR NY
— 631-726 0XXX2XXX7XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 WATER MILL NY
— 631-727 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RIVERHEAD NY
— 631-728 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HAMPTNBAYS NY
— 631-729 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 ATLANTIC NY
— 631-730 0XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 PATCHOGUE NY
— 631-731 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 AMAGANSETT NY
— 631-732 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SELDEN NY
— 631-733 not yet reported which blocks → SCARSDALE SECURITY SYSTEMS, INC. 2612 BRENTWOOD NY
— 631-734 0XXX1XXX3XXX8XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 PECONIC NY
— 631-736 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SELDEN NY
— 631-737 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-738 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-739 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 RONKONKOMA NY
— 631-740 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 RIVERHEAD NY
— 631-744 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SHOREHAM NY
— 631-748 not yet reported which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 BRENTWOOD NY
— 631-749 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 SHELTER IS NY
— 631-750 3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 SAYVILLE NY
— 631-751 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 STONYBROOK NY
— 631-752 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-753 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-754 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NORTHPORT NY
— 631-755 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-756 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-757 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NORTHPORT NY
— 631-758 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 PATCHOGUE NY
— 631-759 0XXX1XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 HUNTINGTON NY
— 631-760 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 HUNTINGTON NY
— 631-761 none assigned yet which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 CENTRAISLP NY
— 631-762 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 STONYBROOK NY
— 631-763 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 COLDSPGHBR NY
— 631-765 7XXX8XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 SOUTHOLD NY
— 631-768 3XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J FARMINGDL NY
— 631-769 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 SHOREHAM NY
— 631-770 3XXX5XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 FARMINGDL NY
— 631-772 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 ATLANTIC NY
— 631-773 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J FARMINGDL 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.