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 585
VERIZON NEW YORK, INC. 40
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
2004-07-25 585-297 0–9 XXXall 10 · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 BATAVIA NY
2002-05-01 585-702 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 XXXXXXXXXX NY
2001-11-30 585-644 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 XXXXXXXXXX NY
— 585-268 0XXX1XXX2XXX3XXX4XXX6XXX8XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 BELMONT NY
— 585-322 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 BLISS NY
— 585-343 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BATAVIA NY
— 585-344 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BATAVIA NY
— 585-345 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BATAVIA NY
— 585-365 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 BELFAST NY
— 585-437 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 RUSHFORD NY
— 585-457 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 JAVA NY
— 585-466 0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 ANGELICA NY
— 585-492 6XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 ARCADE NY
— 585-496 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 CHAFFEE NY
— 585-535 1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 VARYSBURG NY
— 585-542 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 AKRON NY
— 585-548 0XXX1XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 BYRON NY
— 585-589 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 ALBION NY
— 585-590 0XXX1XXX2XXX4XXX6XXX7XXX9XXX which blocks → VERIZON NEW YORK, INC. 9104 ALBION NY
— 585-591 5XXX6XXX7XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 ATTICA NY
— 585-593 8XXX which blocks → VERIZON NEW YORK, INC. 9104 WELLSVILLE NY
— 585-596 0XXX1XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 WELLSVILLE NY
— 585-638 0XXX1XXX2XXX3XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 HOLLEY NY
— 585-652 0XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 EASTAURORA NY
— 585-655 3XXX4XXX6XXX7XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 EASTAURORA NY
— 585-659 0XXX1XXX3XXX4XXX6XXX7XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 KENDALL NY
— 585-676 0–9 XXXall 10 · 7 holders which blocks → VERIZON NEW YORK, INC. 9104 FRANKLINVL NY
— 585-682 0XXX1XXX2XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 WATERPORT NY
— 585-687 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 EASTAURORA NY
— 585-735 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 MIDDLEPORT NY
— 585-757 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 ELBA NY
— 585-765 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 LYNDONVL NY
— 585-798 7XXX which blocks → VERIZON NEW YORK, INC. 9104 MEDINA NY
— 585-805 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → VERIZON NEW YORK, INC. 9104 EASTAURORA NY
— 585-813 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → VERIZON NEW YORK, INC. 9104 BATAVIA NY
— 585-928 0XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 BOLIVAR NY
— 585-948 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 OAKFIELD NY
— 585-968 4XXX6XXX7XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 CUBA NY
— 585-973 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 FRIENDSHIP NY
— 585-977 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 XXXXXXXXXX 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.