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 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
2012-08-10 740-731 0–9 XXXall 10 · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 ATHENS OH
2001-06-26 740-577 0–9 XXXall 10 · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 JACKSON OH
2001-05-03 740-631 1XXX2XXX3XXX4XXX6XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SUMMERFLD OH
— 740-223 5XXX6XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-226 0XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BEAVER OH
— 740-247 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 LETART FLS OH
— 740-259 7XXX which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-269 5XXX which blocks → FRONTIER NORTH, INC. - OH 0615 BOWERSTON OH
— 740-286 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 JACKSON OH
— 740-288 8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 JACKSON OH
— 740-289 7XXX which blocks → FRONTIER NORTH, INC. - OH 0615 PIKETON OH
— 740-327 0XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 COOPERDALE OH
— 740-332 5XXX which blocks → FRONTIER NORTH, INC. - OH 0615 LAURELVL OH
— 740-351 7XXX8XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-353 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-354 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-355 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-356 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-362 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 DELAWARE OH
— 740-363 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 DELAWARE OH
— 740-368 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 DELAWARE OH
— 740-369 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 DELAWARE OH
— 740-372 1XXX7XXX8XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-375 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-380 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 LOGAN OH
— 740-382 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-383 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-384 8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 WELLSTON OH
— 740-385 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 LOGAN OH
— 740-386 none assigned yet which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-387 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-389 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-395 0XXX1XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 JACKSON OH
— 740-420 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 CIRCLEVL OH
— 740-432 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 CAMBRIDGE OH
— 740-435 4XXX5XXX6XXX7XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 CAMBRIDGE OH
— 740-439 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 CAMBRIDGE OH
— 740-448 0XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 AMESVILLE OH
— 740-456 2XXX3XXX7XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-465 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MORRAL OH
— 740-467 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MILLERSPT OH
— 740-468 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PLEASANTVL OH
— 740-474 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 CIRCLEVL OH
— 740-477 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 CIRCLEVL OH
— 740-482 0XXX4XXX6XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NEVADA OH
— 740-493 0XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 IDAHO OH
— 740-494 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PROSPECT OH
— 740-496 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 HARPSTER OH
— 740-499 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 LA RUE OH
— 740-524 7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 KILBOURNE 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.