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 251
FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 15
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
— 251-248 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 REPTON AL
— 251-258 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 GOSPORT AL
— 251-267 7XXX8XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 FRISCOCITY AL
— 251-282 none assigned yet which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 FINCHBURG AL
— 251-294 6XXX which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 4464 HUXFORD AL
— 251-368 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 4464 ATMORE AL
— 251-446 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 4464 ATMORE AL
— 251-564 0XXX which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 PETERMAN AL
— 251-575 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 MONROEVL AL
— 251-577 0XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 4464 MCCULLOUGH AL
— 251-743 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 MONROEVL AL
— 251-746 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 PINE APPLE AL
— 251-765 0XXX1XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 EXCEL AL
— 251-789 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 BEATRICE AL
— 251-862 0XXX1XXX3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 URIAH AL

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.