NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 315
WINDSTREAM NEW YORK, INC. - FULTON 18
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
2017-07-03 315-260 0–9 XXXall 10 · 6 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 MUNNSVILLE NY
2011-05-09 315-862 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 MARCELLUS NY
2011-05-09 315-892 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 PHOENIX NY
2011-05-09 315-932 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 MANLIUS NY
2011-05-09 315-962 0–9 XXXall 10 · 4 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 CAZENOVIA NY
2011-05-09 315-972 0XXX2XXX3XXX7XXX · 2 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 W WINFIELD NY
— 315-495 3XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 MUNNSVILLE NY
— 315-591 none assigned yet which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 FULTON NY
— 315-592 none assigned yet which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 FULTON NY
— 315-593 not yet reported which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 FULTON NY
— 315-598 not yet reported which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 FULTON NY
— 315-655 not yet reported which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 CAZENOVIA NY
— 315-668 1XXX5XXX which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 CENTRAL SQ NY
— 315-673 5XXX6XXX7XXX · 3 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 MARCELLUS NY
— 315-676 0XXX6XXX8XXX · 3 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 CENTRAL SQ NY
— 315-682 not yet reported which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 MANLIUS NY
— 315-695 not yet reported which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 PHOENIX NY
— 315-822 7XXX8XXX · 2 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 W WINFIELD NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.