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
— 631-475 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 PATCHOGUE NY
— 631-476 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 PTJEFFERSN NY
— 631-477 5XXX6XXX7XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 GREENPORT NY
— 631-491 2XXX which blocks → VERIZON NEW YORK, INC. 9104 MIDLAND NY
— 631-492 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 DEER PARK NY
— 631-493 7XXX8XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 W COMMACK NY
— 631-499 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 W COMMACK NY
— 631-501 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-506 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 RIVERHEAD NY
— 631-531 2XXX which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-537 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BRIDGEMPTN NY
— 631-541 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN09 NY
— 631-543 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 COMMACK NY
— 631-544 1XXX2XXX7XXX8XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 KINGS PARK NY
— 631-547 2XXX3XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-548 1XXX5XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 RIVERHEAD NY
— 631-549 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-563 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SAYVILLE NY
— 631-567 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SAYVILLE NY
— 631-577 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-580 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-581 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 ISLIP NY
— 631-582 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 CENTRAISLP NY
— 631-583 1XXX3XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 FIREISLAND NY
— 631-584 1XXX which blocks → VERIZON NEW YORK, INC. 9104 ST JAMES NY
— 631-585 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-586 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 DEER PARK NY
— 631-587 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BABYLON NY
— 631-588 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-589 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SAYVILLE NY
— 631-595 0XXX3XXX4XXX5XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 DEER PARK NY
— 631-597 0XXX1XXX2XXX3XXX5XXX8XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 E FIRE IS NY
— 631-598 5XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 AMITYVILLE NY
— 631-632 0XXX which blocks → VERIZON NEW YORK, INC. 9104 STONYBROOK NY
— 631-642 6XXX7XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 PTJEFFERSN NY
— 631-643 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 MIDLAND NY
— 631-653 0XXX1XXX2XXX7XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 QUOGUE NY
— 631-654 6XXX which blocks → VERIZON NEW YORK, INC. 9104 PATCHOGUE NY
— 631-661 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BABYLON NY
— 631-665 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BAY SHORE NY
— 631-666 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BAY SHORE NY
— 631-667 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 DEER PARK NY
— 631-668 8XXX which blocks → VERIZON NEW YORK, INC. 9104 MONTAUK PT NY
— 631-669 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BABYLON NY
— 631-673 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 HUNTINGTON NY
— 631-679 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN09 NY
— 631-687 0XXX7XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 PATCHOGUE NY
— 631-689 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 STONYBROOK NY
— 631-691 8XXX9XXX which blocks → VERIZON NEW YORK, INC. 9104 AMITYVILLE NY
— 631-692 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 COLDSPGHBR 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.