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 937
FRONTIER NORTH, INC. - OH 53
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
2016-03-30 937-992 0XXX1XXX2XXX3XXX4XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WILMINGTON OH
2001-05-29 937-752 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SEAMAN OH
2001-05-11 937-366 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WILMINGTON OH
— 937-283 4XXX5XXX which blocks → FRONTIER NORTH, INC. - OH 0615 WILMINGTON OH
— 937-289 none assigned yet which blocks → FRONTIER NORTH, INC. - OH 0615 CLARKSVL OH
— 937-332 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 TROY OH
— 937-335 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 TROY OH
— 937-339 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 TROY OH
— 937-364 3XXX4XXX5XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 LYNCHBURG OH
— 937-373 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 DECATUR OH
— 937-375 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 HIGGINSPT OH
— 937-377 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 RUSSELLVL OH
— 937-378 8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 GEORGETOWN OH
— 937-379 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 HAMERSVL OH
— 937-382 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 WILMINGTON OH
— 937-383 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 WILMINGTON OH
— 937-386 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SEAMAN OH
— 937-440 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 TROY OH
— 937-442 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MOWRYSTOWN OH
— 937-444 5XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MOUNT ORAB OH
— 937-446 0XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SARDINIA OH
— 937-486 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PT WILLIAM OH
— 937-488 0XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NEWBRLNGTN OH
— 937-544 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 WEST UNION OH
— 937-549 0XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MANCHESTER OH
— 937-584 0XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SABINA OH
— 937-587 0XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PEEBLES OH
— 937-588 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SINKINGSPG OH
— 937-655 6XXX7XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WILMINGTON OH
— 937-667 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 TIPP CITY OH
— 937-669 7XXX which blocks → FRONTIER NORTH, INC. - OH 0615 TIPP CITY OH
— 937-685 0XXX1XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MARTINSVL OH
— 937-687 5XXX6XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NEWLEBANON OH
— 937-696 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 FARMERSVL OH
— 937-698 2XXX which blocks → FRONTIER NORTH, INC. - OH 0615 WESTMILTON OH
— 937-780 0XXX1XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 LEESBURG OH
— 937-783 6XXX7XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BLANCHESTR OH
— 937-787 0XXX2XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 GRATIS OH
— 937-826 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WOODSTOCK OH
— 937-828 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 CATAWBA OH
— 937-832 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 ENGLEWOOD OH
— 937-833 7XXX8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 BROOKVILLE OH
— 937-834 4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MECHANCSBG OH
— 937-835 2XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 LIBERTY OH
— 937-836 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 ENGLEWOOD OH
— 937-837 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 TROTWOOD OH
— 937-839 2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WALEXNDRIA OH
— 937-854 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 TROTWOOD OH
— 937-884 0XXX1XXX2XXX3XXX4XXX6XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PHILLIPSBG OH
— 937-947 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 LAURA 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.