NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 219
FRONTIER NORTH, INC.. - IN 41
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
2005-05-05 219-263 0–9 XXXall 10 · 5 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 VALPARAISO IN
— 219-324 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 LA PORTE IN
— 219-325 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 LA PORTE IN
— 219-326 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 LA PORTE IN
— 219-362 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 LA PORTE IN
— 219-364 2XXX5XXX6XXX7XXX · 4 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 WHEELER IN
— 219-369 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 LA PORTE IN
— 219-393 0XXX4XXX8XXX9XXX which blocks → FRONTIER NORTH, INC.. - IN 0772 LA PORTE IN
— 219-395 none assigned yet which blocks → FRONTIER NORTH, INC.. - IN 0772 CHESTERTON IN
— 219-462 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 VALPARAISO IN
— 219-464 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 VALPARAISO IN
— 219-465 none assigned yet which blocks → FRONTIER NORTH, INC.. - IN 0772 VALPARAISO IN
— 219-476 3XXX5XXX6XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 VALPARAISO IN
— 219-477 none assigned yet which blocks → FRONTIER NORTH, INC.. - IN 0772 VALPARAISO IN
— 219-531 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 VALPARAISO IN
— 219-548 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 VALPARAISO IN
— 219-733 3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 WANATAH IN
— 219-734 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 PORTAGE IN
— 219-754 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 LA CROSSE IN
— 219-759 9XXX which blocks → FRONTIER NORTH, INC.. - IN 0772 WHEELER IN
— 219-762 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 PORTAGE IN
— 219-763 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 PORTAGE IN
— 219-764 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 PORTAGE IN
— 219-766 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 KOUTS IN
— 219-767 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 UNIONMILLS IN
— 219-778 0XXX3XXX5XXX6XXX7XXX · 5 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 ROLLNGPRRI IN
— 219-785 0XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 WESTVILLE IN
— 219-787 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 PORTAGE IN
— 219-797 0XXX1XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 HANNA IN
— 219-841 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 PORTAGE IN
— 219-921 none assigned yet which blocks → FRONTIER NORTH, INC.. - IN 0772 CHESTERTON IN
— 219-926 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 CHESTERTON IN
— 219-928 none assigned yet which blocks → FRONTIER NORTH, INC.. - IN 0772 CHESTERTON IN
— 219-929 none assigned yet which blocks → FRONTIER NORTH, INC.. - IN 0772 CHESTERTON IN
— 219-940 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 HOBART IN
— 219-942 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 HOBART IN
— 219-945 2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 HOBART IN
— 219-947 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 HOBART IN
— 219-962 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 LAKE STA IN
— 219-963 6XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 LAKE STA IN
— 219-983 none assigned yet which blocks → FRONTIER NORTH, INC.. - IN 0772 CHESTERTON IN

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.