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
— 631-849 0–9 XXXall 10 · 4 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 SHOREHAM NY
— 631-850 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 W COMMACK NY
— 631-851 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 CENTRAISLP NY
— 631-852 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RIVERHEAD NY
— 631-853 0XXX9XXX which blocks → VERIZON NEW YORK, INC. 9104 CENTRAISLP NY
— 631-854 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BRENTWOOD NY
— 631-855 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 DEER PARK NY
— 631-856 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K HAMPTNBAYS NY
— 631-857 3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 COLDSPGHBR NY
— 631-858 4XXX which blocks → VERIZON NEW YORK, INC. 9104 W COMMACK NY
— 631-859 2XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 ISLIP NY
— 631-860 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DEER PARK NY
— 631-861 0XXX3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 FARMINGDL NY
— 631-862 2XXX4XXX5XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 ST JAMES NY
— 631-863 3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 SMITHTOWN NY
— 631-864 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 COMMACK NY
— 631-865 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 DEER PARK NY
— 631-866 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 BELLPORT NY
— 631-867 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 LINDENHST NY
— 631-868 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 BAYPORT NY
— 631-869 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 BELLPORT NY
— 631-870 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J CENTRAISLP NY
— 631-874 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 CTRMORICHS NY
— 631-878 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 CTRMORICHS NY
— 631-879 1XXX2XXX3XXX5XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 PATCHOGUE NY
— 631-881 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → AT&T - LOCAL 7421 CENTRAISLP NY
— 631-883 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 BAYPORT NY
— 631-884 4XXX which blocks → VERIZON NEW YORK, INC. 9104 LINDENHST NY
— 631-886 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 WADING RIV NY
— 631-888 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 LINDENHST NY
— 631-890 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 PATCHOGUE NY
— 631-892 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 BAY SHORE NY
— 631-893 9XXX which blocks → VERIZON NEW YORK, INC. 9104 BABYLON NY
— 631-894 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 BAY SHORE NY
— 631-895 0XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → ONVOY, LLC- NY 384C QUOGUE NY
— 631-898 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 WESTHAMPTN NY
— 631-899 0XXX1XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SAG HARBOR NY
— 631-900 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC- NY 384C W COMMACK NY
— 631-904 0XXX1XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 CENTRAISLP NY
— 631-905 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 RIVERHEAD NY
— 631-907 2XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 E HAMPTON NY
— 631-909 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 CTRMORICHS NY
— 631-910 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → XO NEW YORK, INC. 8340 WADING RIV NY
— 631-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 631-912 3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 NORTHPORT NY
— 631-913 1XXX3XXX5XXX6XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 RONKONKOMA NY
— 631-915 not yet reported which blocks → AMERICAN NETWORK, INC. 8667 RIVERHEAD NY
— 631-918 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 DEER PARK NY
— 631-919 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC- NY 384C SAG HARBOR NY
— 631-920 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 MIDLAND 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.