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 574
FRONTIER NORTH, INC.. - IN 45
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
2010-08-03 574-364 0–9 XXXall 10 · 6 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 GOSHEN IN
— 574-206 3XXX4XXX5XXX6XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-262 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-264 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-266 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-293 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-294 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-295 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-296 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-342 7XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 BOURBON IN
— 574-353 0XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 MENTONE IN
— 574-382 0XXX1XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 MACY IN
— 574-389 6XXX which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-491 0XXX which blocks → FRONTIER NORTH, INC.. - IN 0772 BURKET IN
— 574-498 0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 TIPPECANOE IN
— 574-522 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-523 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-524 0XXX5XXX6XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-533 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 GOSHEN IN
— 574-534 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 GOSHEN IN
— 574-535 none assigned yet which blocks → FRONTIER NORTH, INC.. - IN 0772 GOSHEN IN
— 574-537 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 GOSHEN IN
— 574-538 1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 GOSHEN IN
— 574-566 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 CLAYPOOL IN
— 574-626 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 WALTON IN
— 574-633 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 WYATT IN
— 574-643 0XXX1XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 ROYAL CTR IN
— 574-646 4XXX6XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 MILLWOOD IN
— 574-699 2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 GALVESTON IN
— 574-722 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 LOGANSPORT IN
— 574-725 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 LOGANSPORT IN
— 574-732 7XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 LOGANSPORT IN
— 574-735 1XXX which blocks → FRONTIER NORTH, INC.. - IN 0772 LOGANSPORT IN
— 574-737 0XXX1XXX4XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 LOGANSPORT IN
— 574-739 5XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 LOGANSPORT IN
— 574-753 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 LOGANSPORT IN
— 574-825 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 MIDDLEBURY IN
— 574-848 3XXX6XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 BRISTOL IN
— 574-857 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 FULTON IN
— 574-858 6XXX which blocks → FRONTIER NORTH, INC.. - IN 0772 ATWOOD IN
— 574-862 0XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 WAKARUSA IN
— 574-875 2XXX which blocks → FRONTIER NORTH, INC.. - IN 0772 DUNLAP IN
— 574-889 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 LUCERNE IN
— 574-891 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 DUNLAP IN
— 574-893 0XXX2XXX3XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 AKRON IN

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.