NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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 838
CORETEL NEW YORK, INC. - NY 16
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
2019-02-15 838-500 0XXX2XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 ROUND LAKE NY
2019-02-15 838-766 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 WARRENSBG NY
2019-02-14 838-224 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 WELLS NY
2019-02-14 838-228 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 WINDHAM NY
2019-02-14 838-256 0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 LKPLEASANT NY
2019-02-14 838-282 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 LYON MT NY
2019-02-14 838-336 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 PALENVILLE NY
2019-02-14 838-384 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 CASTLETON NY
2019-02-14 838-386 0–9 XXXall 10 · 4 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 TROY NY
2019-02-14 838-435 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 CLAVERACK NY
2019-02-14 838-438 0–9 XXXall 10 · 6 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 SALEM NY
2019-02-14 838-468 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 WHITEHALL NY
2019-02-14 838-529 0XXX2XXX3XXX9XXX · 3 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 FONDA NY
2019-02-14 838-639 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 DELANSON NY
2019-02-14 838-697 6XXX8XXX · 2 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 BROADALBIN NY
2019-02-14 838-842 0XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 GERMANTOWN NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.