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 507
FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 38
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
— 507-223 3XXX4XXX6XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 CANBY MN
— 507-224 1XXX3XXX4XXX5XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 ST LEO MN
— 507-234 not yet reported which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 JANESVILLE MN
— 507-235 not yet reported which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 FAIRMONT MN
— 507-238 not yet reported which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 FAIRMONT MN
— 507-248 0XXX1XXX2XXX5XXX6XXX7XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 HENDERSON MN
— 507-264 4XXX5XXX6XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 IONA MN
— 507-267 1XXX2XXX3XXX5XXX6XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 ELYSIAN MN
— 507-296 5XXX6XXX7XXX which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 PORTER MN
— 507-326 not yet reported which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 GREEN ISLE MN
— 507-335 2XXX3XXX4XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 AVOCA MN
— 507-357 0XXX1XXX5XXX7XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 LE CENTER MN
— 507-362 not yet reported which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 WATERVILLE MN
— 507-364 0XXX1XXX2XXX3XXX6XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 MONTGOMERY MN
— 507-372 not yet reported which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 WORTHINGTN MN
— 507-376 not yet reported which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 WORTHINGTN MN
— 507-435 3XXX5XXX6XXX8XXX · 4 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 LEWISVILLE MN
— 507-436 2XXX3XXX4XXX6XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 NORTHROP MN
— 507-442 2XXX6XXX9XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 EDGERTON MN
— 507-443 0XXX2XXX3XXX4XXX7XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 LEOTA MN
— 507-483 3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 ADRIAN MN
— 507-595 4XXX5XXX6XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 KILKENNY MN
— 507-632 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 CEYLON MN
— 507-639 0XXX4XXX5XXX8XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 TRIMONT MN
— 507-662 2XXX3XXX4XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 LAKEFIELD MN
— 507-677 3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 CHANDLER MN
— 507-694 not yet reported which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 IVANHOE MN
— 507-728 2XXX3XXX which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 WELCOME MN
— 507-734 7XXX which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 BALATON MN
— 507-763 4XXX5XXX6XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 CURRIE MN
— 507-764 0XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 SHERBURN MN
— 507-773 0XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 EAST CHAIN MN
— 507-776 5XXX6XXX8XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 TRUMAN MN
— 507-836 5XXX which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 SLAYTON MN
— 507-853 1XXX2XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 OKABENA MN
— 507-879 4XXX5XXX6XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 LAKEWILSON MN
— 507-964 0XXX3XXX4XXX6XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 ARLINGTON MN
— 507-967 3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF MINNESOTA, INC. 1367 ELLSWORTH MN

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.