NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
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
2006-02-03 631-319 0–9 XXXall 10 · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 SAYVILLE NY
2005-10-05 631-638 0–9 XXXall 10 · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 STONYBROOK NY
2005-04-01 631-932 0–9 XXXall 10 · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 DEER PARK NY
— 631-204 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 SOUTHAMPTN NY
— 631-205 3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 YAPHANK NY
— 631-206 4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 BAY SHORE NY
— 631-207 8XXX which blocks → VERIZON NEW YORK, INC. 9104 PATCHOGUE NY
— 631-208 5XXX6XXX7XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 RIVERHEAD NY
— 631-209 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 SHOREHAM NY
— 631-216 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 STONYBROOK NY
— 631-218 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SAYVILLE NY
— 631-221 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN09 NY
— 631-222 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 XXXXXXXXXX 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
— 631-231 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
— 631-242 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
— 631-249 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL 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
— 631-259 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
— 631-264 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
— 631-271 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
— 631-281 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
— 631-293 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.