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 419
FRONTIER NORTH, INC. - OH 114
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
2002-07-15 419-597 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SCOTT OH
2001-05-29 419-921 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NORWALK OH
2001-05-29 419-922 1XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 HAYESVILLE OH
2001-04-26 419-703 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → FRONTIER NORTH, INC. - OH 0615 EVANSPORT OH
2001-04-26 419-809 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PIONEER OH
2001-04-26 419-880 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 HELENA OH
2001-04-26 419-881 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 HICKSVILLE OH
— 419-207 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 ASHLAND OH
— 419-237 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 FAYETTE OH
— 419-257 6XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NO BALTIMR OH
— 419-258 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 ANTWERP OH
— 419-263 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PAYNE OH
— 419-268 4XXX8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 CELINA OH
— 419-272 0XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 EDON OH
— 419-273 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 FOREST OH
— 419-281 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 ASHLAND OH
— 419-282 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 ASHLAND OH
— 419-285 6XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PUT IN BAY OH
— 419-287 2XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PEMBERVL OH
— 419-288 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WAYNEBRDNR OH
— 419-289 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 ASHLAND OH
— 419-293 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MCCOMB OH
— 419-298 4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 EDGERTON OH
— 419-299 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - OH 0615 VAN BUREN OH
— 419-326 0XXX2XXX3XXX5XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 JENERA OH
— 419-336 0XXX2XXX6XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NORTH STAR OH
— 419-352 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 BOWLNGGREN OH
— 419-353 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 BOWLNGGREN OH
— 419-354 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 BOWLNGGREN OH
— 419-365 2XXX3XXX4XXX6XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 ARLINGTON OH
— 419-368 2XXX which blocks → FRONTIER NORTH, INC. - OH 0615 HAYESVILLE OH
— 419-373 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 BOWLNGGREN OH
— 419-375 5XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 FTRECOVERY OH
— 419-394 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 ST MARYS OH
— 419-396 0XXX2XXX4XXX5XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 CAREY OH
— 419-426 none assigned yet which blocks → FRONTIER NORTH, INC. - OH 0615 ATTICA OH
— 419-428 1XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 EVANSPORT OH
— 419-433 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 HURON OH
— 419-458 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WHARTON OH
— 419-462 9XXX which blocks → FRONTIER NORTH, INC. - OH 0615 GALION OH
— 419-465 0XXX1XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MONROEVL OH
— 419-468 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 GALION OH
— 419-483 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 BELLEVUE OH
— 419-484 0XXX1XXX3XXX4XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BELLEVUE OH
— 419-485 7XXX which blocks → FRONTIER NORTH, INC. - OH 0615 MONTPELIER OH
— 419-492 0XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NEWWSHNGTN OH
— 419-495 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WILSHIWREN OH
— 419-499 7XXX which blocks → FRONTIER NORTH, INC. - OH 0615 MILAN OH
— 419-542 3XXX which blocks → FRONTIER NORTH, INC. - OH 0615 HICKSVILLE OH
— 419-547 5XXX which blocks → FRONTIER NORTH, INC. - OH 0615 CLYDE 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.