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 715
FRONTIER NORTH INC. - WI 55
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
2006-02-09 715-870 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
2001-06-12 715-337 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 EAGLERIVER WI
2001-06-08 715-368 1XXX2XXX6XXX7XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 SPENCER WI
2001-06-08 715-388 1XXX2XXX3XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 LCDFLAMBEU WI
2001-06-08 715-391 1XXX2XXX3XXX5XXX7XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 STRATFORD WI
2001-06-08 715-393 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
2001-06-08 715-396 1XXX3XXX8XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 OWEN WI
— 715-221 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 MARSHFIELD WI
— 715-223 5XXX7XXX9XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 COLBY WI
— 715-224 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 TOMAHAWK WI
— 715-229 0XXX1XXX3XXX5XXX6XXX7XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 OWEN WI
— 715-241 1XXX which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
— 715-255 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 LOYAL WI
— 715-257 0XXX2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 ATHENS WI
— 715-261 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
— 715-348 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
— 715-352 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 EDGAR WI
— 715-355 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
— 715-356 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 MINOCQUA WI
— 715-358 0XXX which blocks → FRONTIER NORTH INC. - WI 0886 MINOCQUA WI
— 715-359 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
— 715-383 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 MARSHFIELD WI
— 715-384 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 MARSHFIELD WI
— 715-387 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 MARSHFIELD WI
— 715-389 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 MARSHFIELD WI
— 715-443 0XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 MARATHON WI
— 715-446 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 HATLEY WI
— 715-449 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 BIRNAMWOOD WI
— 715-453 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 TOMAHAWK WI
— 715-477 4XXX7XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 EAGLERIVER WI
— 715-479 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 EAGLERIVER WI
— 715-484 0XXX1XXX6XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 PICKEREL WI
— 715-486 5XXX6XXX7XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 MARSHFIELD WI
— 715-489 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 MATTOON WI
— 715-536 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 MERRILL WI
— 715-539 6XXX7XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 MERRILL WI
— 715-542 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH INC. - WI 0886 SAYNER WI
— 715-545 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → FRONTIER NORTH INC. - WI 0886 PHELPS WI
— 715-546 0XXX5XXX6XXX7XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 THREELAKES WI
— 715-547 0XXX2XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH INC. - WI 0886 LANDOLAKES WI
— 715-588 5XXX8XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 LCDFLAMBEU WI
— 715-623 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 ANTIGO WI
— 715-627 8XXX which blocks → FRONTIER NORTH INC. - WI 0886 ANTIGO WI
— 715-659 0XXX6XXX7XXX9XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 SPENCER WI
— 715-675 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
— 715-679 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
— 715-687 6XXX which blocks → FRONTIER NORTH INC. - WI 0886 STRATFORD WI
— 715-841 0XXX9XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
— 715-842 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
— 715-843 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI

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.