NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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 740
FRONTIER NORTH, INC. - OH 123
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
— 740-528 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 GREEN CAMP OH
— 740-543 6XXX7XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 AMSTERDAM OH
— 740-544 1XXX2XXX3XXX4XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 KNOXVILLE OH
— 740-546 1XXX2XXX5XXX6XXX7XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 ADENA OH
— 740-548 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 CHESHIRCTR OH
— 740-549 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 CHESHIRCTR OH
— 740-566 1XXX2XXX3XXX5XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 ATHENS OH
— 740-569 2XXX3XXX5XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BREMEN OH
— 740-574 3XXX7XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-585 0XXX1XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 LOWERSALEM OH
— 740-589 0XXX1XXX2XXX6XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 ATHENS OH
— 740-592 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 ATHENS OH
— 740-593 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 ATHENS OH
— 740-594 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 ATHENS OH
— 740-595 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - OH 0615 RADNOR OH
— 740-596 6XXX7XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MCARTHUR OH
— 740-597 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 ATHENS OH
— 740-598 0XXX2XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BRILLIANT OH
— 740-657 9XXX which blocks → FRONTIER NORTH, INC. - OH 0615 CHESHIRCTR OH
— 740-658 0XXX2XXX6XXX7XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 FREEPORT OH
— 740-662 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 GUYSVILLE OH
— 740-664 0XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NEWMRSHFLD OH
— 740-666 4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 OSTRANDER OH
— 740-669 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WILKESVL OH
— 740-678 4XXX5XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BARLOW OH
— 740-682 2XXX5XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 OAK HILL OH
— 740-685 4XXX which blocks → FRONTIER NORTH, INC. - OH 0615 BYESVILLE OH
— 740-696 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SHADE OH
— 740-698 8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 ALBANY OH
— 740-725 4XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-726 0XXX1XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WALDO OH
— 740-732 8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 CALDWELL OH
— 740-733 1XXX2XXX3XXX4XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SMITHFIELD OH
— 740-742 5XXX6XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 POMEROY OH
— 740-747 4XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 ASHLEY OH
— 740-749 1XXX2XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WATERTOWN OH
— 740-765 0XXX1XXX2XXX3XXX6XXX7XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 RICHMOND OH
— 740-768 3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BERGHOLZ OH
— 740-769 0XXX6XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 DLVLMTPLNT OH
— 740-776 5XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-778 0XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-783 7XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 DEXTERCITY OH
— 740-797 5XXX6XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 THE PLAINS OH
— 740-824 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WARSAW OH
— 740-826 3XXX5XXX which blocks → FRONTIER NORTH, INC. - OH 0615 NEWCONCORD OH
— 740-833 0XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 DELAWARE OH
— 740-838 3XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SUMMERFLD OH
— 740-843 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PORTLAND OH
— 740-857 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 RESACA OH
— 740-858 7XXX8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.