NumberResearch Membership · Data 09/23/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026

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
— 631-298 7XXX which blocks → VERIZON NEW YORK, INC. 9104 MATTITUCK NY
— 631-300 0XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 BRENTWOOD NY
— 631-321 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BABYLON 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
— 631-329 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
— 631-341 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
— 631-351 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON 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
— 631-363 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
— 631-376 9XXX which blocks → VERIZON NEW YORK, INC. 9104 BABYLON 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
— 631-391 6XXX which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-395 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 ATLANTIC NY
— 631-399 8XXX which blocks → VERIZON NEW YORK, INC. 9104 ATLANTIC NY
— 631-419 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → VERIZON NEW YORK, INC. 9104 BAYPORT NY
— 631-420 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-421 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-422 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BABYLON NY
— 631-423 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-424 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-425 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-427 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-434 0XXX5XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 BRENTWOOD NY
— 631-435 5XXX which blocks → VERIZON NEW YORK, INC. 9104 BRENTWOOD NY
— 631-436 1XXX3XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 BRENTWOOD NY
— 631-444 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 STONYBROOK NY
— 631-447 4XXX which blocks → VERIZON NEW YORK, INC. 9104 PATCHOGUE NY
— 631-451 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SELDEN NY
— 631-454 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-462 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 W COMMACK NY
— 631-467 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-468 6XXX7XXX8XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-471 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-472 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BAYPORT NY
— 631-473 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 PTJEFFERSN NY
— 631-474 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 PTJEFFERSN NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.