NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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 330
FRONTIER NORTH, INC. - OH 56
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
2002-10-07 330-636 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MEDINA OH
2001-06-06 330-558 1XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BRUNSWICK OH
2001-05-08 330-663 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NEWPHLDLPH OH
— 330-220 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 BRUNSWICK OH
— 330-222 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WINONA OH
— 330-223 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 HANOVERTON OH
— 330-225 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 BRUNSWICK OH
— 330-239 8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 SHARON CTR OH
— 330-273 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 BRUNSWICK OH
— 330-308 2XXX4XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NEWPHLDLPH OH
— 330-334 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 WADSWORTH OH
— 330-335 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 WADSWORTH OH
— 330-336 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 WADSWORTH OH
— 330-339 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 NEWPHLDLPH OH
— 330-343 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 NEWPHLDLPH OH
— 330-359 1XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WILMOT OH
— 330-364 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 NEWPHLDLPH OH
— 330-365 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NEWPHLDLPH OH
— 330-435 2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 CRESTON OH
— 330-483 1XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 VALLEYCITY OH
— 330-525 1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NOGEORGETN OH
— 330-527 1XXX6XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 GARRETTSVL OH
— 330-602 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 NEWPHLDLPH OH
— 330-624 2XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BURBANK OH
— 330-625 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 HOMERVILLE OH
— 330-627 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 CARROLLTON OH
— 330-648 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SPENCER OH
— 330-664 9XXX which blocks → FRONTIER NORTH, INC. - OH 0615 MONTROSE OH
— 330-665 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MONTROSE OH
— 330-666 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MONTROSE OH
— 330-667 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 CHATHAM OH
— 330-668 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MONTROSE OH
— 330-670 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MONTROSE OH
— 330-721 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MEDINA OH
— 330-722 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MEDINA OH
— 330-723 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MEDINA OH
— 330-725 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MEDINA OH
— 330-735 0XXX6XXX7XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 DELLROY OH
— 330-738 0XXX1XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MECHANCSTN OH
— 330-739 0XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 HARLEM SPG OH
— 330-756 1XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BEACH CITY OH
— 330-764 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MEDINA OH
— 330-767 1XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BREWSTER OH
— 330-769 6XXX7XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SEVILLE OH
— 330-852 5XXX6XXX which blocks → FRONTIER NORTH, INC. - OH 0615 SUGARCREEK OH
— 330-859 0XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MINERAL CY OH
— 330-862 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PARIS OH
— 330-863 3XXX4XXX5XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MALVERN OH
— 330-868 8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 MINERVA OH
— 330-874 6XXX7XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BOLIVAR OH

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.