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 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
— 419-582 0XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 YORKSHIRE OH
— 419-584 3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 CELINA OH
— 419-585 1XXX4XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 REPUBLIC OH
— 419-586 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 CELINA OH
— 419-588 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BERLIN HTS OH
— 419-622 5XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SCOTT OH
— 419-628 5XXX6XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MINSTER OH
— 419-629 5XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NEW BREMEN OH
— 419-630 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BRYAN OH
— 419-633 none assigned yet which blocks → FRONTIER NORTH, INC. - OH 0615 BRYAN OH
— 419-635 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PT CLINTON OH
— 419-636 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 BRYAN OH
— 419-637 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 GIBSONBURG OH
— 419-638 4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 HELENA OH
— 419-647 2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SPENCERVL OH
— 419-658 0XXX1XXX3XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NEY OH
— 419-660 3XXX5XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NORWALK OH
— 419-663 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 NORWALK OH
— 419-668 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 NORWALK OH
— 419-669 5XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WESTON OH
— 419-678 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 COLDWATER OH
— 419-683 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 CRESTLINE OH
— 419-687 1XXX4XXX5XXX7XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PLYMOUTH OH
— 419-694 0XXX3XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MTBLANCHAD OH
— 419-732 5XXX which blocks → FRONTIER NORTH, INC. - OH 0615 PT CLINTON OH
— 419-734 8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 PT CLINTON OH
— 419-737 0XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PIONEER OH
— 419-744 0XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 NORWALK OH
— 419-746 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - OH 0615 KELLEYS IS OH
— 419-749 0XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 CONVOY OH
— 419-752 9XXX which blocks → FRONTIER NORTH, INC. - OH 0615 GREENWICH OH
— 419-795 2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MENDON OH
— 419-797 5XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PT CLINTON OH
— 419-798 3XXX6XXX7XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MARBLEHEAD OH
— 419-823 6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 HASKISTGNY OH
— 419-824 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 SYLVANIA OH
— 419-827 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - OH 0615 LAKEVILLE OH
— 419-832 9XXX which blocks → FRONTIER NORTH, INC. - OH 0615 GRAND RPDS OH
— 419-836 0XXX which blocks → FRONTIER NORTH, INC. - OH 0615 CURTICORGN OH
— 419-841 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 SYLVANIA OH
— 419-842 4XXX which blocks → FRONTIER NORTH, INC. - OH 0615 SYLVANIA OH
— 419-843 0XXX which blocks → FRONTIER NORTH, INC. - OH 0615 SYLVANIA OH
— 419-846 2XXX5XXX7XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 CONGRESS OH
— 419-853 5XXX6XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WEST SALEM OH
— 419-855 2XXX5XXX6XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 GENOA OH
— 419-862 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 ELMORE OH
— 419-869 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 8 holders which blocks → FRONTIER NORTH, INC. - OH 0615 REDHAW OH
— 419-882 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 SYLVANIA OH
— 419-885 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 SYLVANIA OH
— 419-898 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 OAK HARBOR 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.