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
— 631-293 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-295 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 YAPHANK NY
— 631-297 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J CENTRAISLP NY
— 631-298 7XXX which blocks → VERIZON NEW YORK, INC. 9104 MATTITUCK NY
— 631-299 1XXX8XXX9XXX which blocks → PAETEC ITEL, LLC 829J BRENTWOOD NY
— 631-300 0XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 BRENTWOOD NY
— 631-302 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC- NY 384C E FIRE IS NY
— 631-306 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 DEER PARK NY
— 631-307 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PATCHOGUE NY
— 631-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 631-312 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 PATCHOGUE NY
— 631-314 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H BABYLON NY
— 631-321 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BABYLON NY
— 631-322 not yet reported which blocks → SPOK, INC. 6630 BRENTWOOD NY
— 631-323 4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 ORIENT NY
— 631-324 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 E HAMPTON NY
— 631-325 4XXX5XXX6XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 EASTPORT NY
— 631-326 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 COMMACK NY
— 631-328 1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J BAY SHORE NY
— 631-329 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 E HAMPTON NY
— 631-331 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 PTJEFFERSN NY
— 631-334 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 CENTRAISLP NY
— 631-337 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SAYVILLE NY
— 631-340 not yet reported which blocks → SPOK, INC. 6630 BABYLON NY
— 631-341 0XXX3XXX4XXX5XXX7XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 YAPHANK NY
— 631-342 3XXX5XXX which blocks → VERIZON NEW YORK, INC. 9104 CENTRAISLP NY
— 631-344 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 YAPHANK NY
— 631-345 1XXX4XXX7XXX8XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 YAPHANK NY
— 631-348 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 CENTRAISLP NY
— 631-350 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 HUNTINGTON NY
— 631-351 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-354 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 MATTITUCK NY
— 631-357 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 BRENTWOOD NY
— 631-360 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SMITHTOWN NY
— 631-361 0XXX1XXX which blocks → VERIZON NEW YORK, INC. 9104 SMITHTOWN NY
— 631-362 not yet reported which blocks → NY
— 631-363 1XXX4XXX which blocks → VERIZON NEW YORK, INC. 9104 BAYPORT NY
— 631-366 7XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 SMITHTOWN NY
— 631-367 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 COLDSPGHBR NY
— 631-368 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 W COMMACK NY
— 631-369 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RIVERHEAD NY
— 631-370 7XXX which blocks → TC SYSTEMS, INC. - NY 7140 FARMINGDL NY
— 631-373 not yet reported which blocks → SPOK, INC. 6630 BRENTWOOD NY
— 631-376 9XXX which blocks → VERIZON NEW YORK, INC. 9104 BABYLON NY
— 631-378 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SHOREHAM NY
— 631-380 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 STONYBROOK NY
— 631-382 0XXX1XXX6XXX8XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 SMITHTOWN NY
— 631-385 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-386 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J FARMINGDL NY
— 631-387 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 COMMACK 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.