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
— 631-222 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 XXXXXXXXXX NY
— 631-223 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 HUNTINGTON NY
— 631-224 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 ISLIP NY
— 631-225 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 LINDENHST NY
— 631-226 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 LINDENHST NY
— 631-227 not yet reported which blocks → PAETEC ITEL, LLC 829J FARMINGDL NY
— 631-228 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 SHOREHAM NY
— 631-229 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 AMITYVILLE NY
— 631-231 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BRENTWOOD NY
— 631-232 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 CENTRAISLP NY
— 631-233 5XXX7XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 BRENTWOOD NY
— 631-234 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 CENTRAISLP NY
— 631-236 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 BRENTWOOD NY
— 631-239 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 NORTHPORT NY
— 631-242 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 DEER PARK NY
— 631-243 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 DEER PARK NY
— 631-244 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SAYVILLE NY
— 631-246 0XXX1XXX2XXX3XXX4XXX6XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 STONYBROOK NY
— 631-247 0XXX3XXX6XXX7XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 FARMINGDL NY
— 631-249 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-251 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SAG HARBOR NY
— 631-253 1XXX6XXX7XXX8XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 MIDLAND NY
— 631-254 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 DEER PARK NY
— 631-256 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 SAYVILLE NY
— 631-259 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 SOUTHAMPTN NY
— 631-261 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NORTHPORT NY
— 631-262 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NORTHPORT NY
— 631-263 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 SMITHTOWN NY
— 631-264 3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 AMITYVILLE NY
— 631-265 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SMITHTOWN NY
— 631-266 7XXX8XXX9XXX which blocks → VERIZON NEW YORK, INC. 9104 W COMMACK NY
— 631-267 1XXX4XXX5XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 AMAGANSETT NY
— 631-269 8XXX which blocks → VERIZON NEW YORK, INC. 9104 KINGS PARK NY
— 631-270 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 FARMINGDL NY
— 631-271 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-272 0XXX1XXX2XXX3XXX4XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 CENTRAISLP NY
— 631-273 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BRENTWOOD NY
— 631-274 1XXX5XXX6XXX7XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 DEER PARK NY
— 631-277 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 ISLIP NY
— 631-279 not yet reported which blocks → SPOK, INC. 6630 BRENTWOOD NY
— 631-281 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 ATLANTIC NY
— 631-282 8XXX which blocks → VERIZON NEW YORK, INC. 9104 YAPHANK NY
— 631-283 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SOUTHAMPTN NY
— 631-284 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 RIVERHEAD NY
— 631-285 0XXX1XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-286 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BELLPORT NY
— 631-287 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SOUTHAMPTN NY
— 631-288 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 WESTHAMPTN NY
— 631-289 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 PATCHOGUE NY
— 631-292 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 KINGS PARK 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.