NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 618
FRONTIER NORTH, INC. - IL 126
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
— 618-932 0XXX1XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 WFRANKFORT IL
— 618-934 0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1036 SUMMERFLD IL
— 618-936 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 SUMNER IL
— 618-937 0XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 WFRANKFORT IL
— 618-942 0XXX1XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 HERRIN IL
— 618-943 0XXX9XXX which blocks → FRONTIER NORTH, INC. - IL 1015 LAWRENCEVL IL
— 618-945 none assigned yet which blocks → FRONTIER NORTH, INC. - IL 1015 BRIDGEPORT IL
— 618-947 0XXX4XXX7XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1036 CHAUNCEY IL
— 618-948 0XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 STFRNCISVL IL
— 618-962 2XXX which blocks → FRONTIER NORTH, INC. - IL 1036 OMAHA IL
— 618-963 0XXX5XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ENFIELD IL
— 618-964 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MARION IL
— 618-965 0XXX5XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 STEELEVL IL
— 618-968 0XXX which blocks → FRONTIER NORTH, INC. - IL 1015 MAUNIE IL
— 618-982 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1036 PAULTON IL
— 618-983 0XXX1XXX2XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 JOHNSTONCY IL
— 618-984 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ROYALTON IL
— 618-985 0XXX7XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 CARTERVL IL
— 618-987 4XXX which blocks → FRONTIER NORTH, INC. - IL 1015 HURST IL
— 618-988 0XXX2XXX3XXX4XXX5XXX7XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 HERRIN IL
— 618-993 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 MARION IL
— 618-994 3XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 CARRIERSML IL
— 618-995 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 GOREVILLE IL
— 618-996 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - IL 1015 CREAL SPG IL
— 618-997 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 MARION IL
— 618-998 6XXX7XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MARION IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.