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 646
VERIZON NEW YORK, INC. 92
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
2015-05-20 646-947 0–9 XXXwhole prefix which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2012-12-06 646-517 0–9 XXXall 10 · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2012-12-06 646-589 0–9 XXXall 10 · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2012-08-20 646-635 0–9 XXXwhole prefix which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2012-08-20 646-636 0–9 XXXwhole prefix which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2008-12-22 646-743 0–9 XXXwhole prefix which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2008-09-08 646-556 0–9 XXXall 10 · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2008-05-28 646-433 0–9 XXXwhole prefix which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2008-04-08 646-446 0–9 XXXwhole prefix which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2007-11-27 646-392 0–9 XXXall 10 · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2007-08-21 646-855 0–9 XXXwhole prefix which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2007-04-19 646-857 0–9 XXXall 10 · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2007-02-13 646-333 0–9 XXXwhole prefix which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2005-06-30 646-429 0–9 XXXall 10 · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2005-01-10 646-747 0–9 XXXwhole prefix which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2004-04-30 646-376 0–9 XXXall 10 · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2004-02-04 646-272 0–9 XXXall 10 · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2003-07-31 646-447 0–9 XXXwhole prefix which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2002-07-26 646-997 0–9 XXXwhole prefix which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2002-01-31 646-276 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
2001-11-15 646-610 0–9 XXXall 10 · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-223 0XXX5XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-227 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-230 9XXX which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-231 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-252 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-254 2XXX3XXX6XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-268 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-275 0XXX2XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-282 6XXX8XXX which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-297 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-317 0–9 XXXwhole prefix which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-324 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-336 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-343 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-366 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-368 0–9 XXXall 10 · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-371 0–9 XXXall 10 · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-386 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-394 1XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-422 6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-424 0XXX1XXX which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-426 0–9 XXXwhole prefix which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-442 0–9 XXXall 10 · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-445 0XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-458 1XXX4XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-472 1XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-473 5XXX which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-486 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 646-487 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 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.