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 417
SOUTHWESTERN BELL 100
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
— 417-682 not yet reported which blocks → SOUTHWESTERN BELL 9533 LAMAR MO
— 417-691 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 JOPLIN MO
— 417-695 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 BILLINGS MO
— 417-724 6XXX which blocks → SOUTHWESTERN BELL 9533 NIXA MO
— 417-725 not yet reported which blocks → SOUTHWESTERN BELL 9533 NIXA MO
— 417-730 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-732 0XXX which blocks → SOUTHWESTERN BELL 9533 REPUBLIC MO
— 417-736 0XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 STRAFFORD MO
— 417-742 0XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 WILLARD MO
— 417-743 6XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 CLEVER MO
— 417-744 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BILLINGS MO
— 417-751 0XXX which blocks → SOUTHWESTERN BELL 9533 ASH GROVE MO
— 417-753 0XXX6XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 ROGERSVL MO
— 417-759 0XXX4XXX5XXX6XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 FAIR GROVE MO
— 417-781 not yet reported which blocks → SOUTHWESTERN BELL 9533 JOPLIN MO
— 417-782 not yet reported which blocks → SOUTHWESTERN BELL 9533 JOPLIN MO
— 417-788 5XXX6XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 WALNUT GRV MO
— 417-820 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-823 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-829 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-831 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-832 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-833 7XXX which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-836 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-837 9XXX which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-841 7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-862 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-863 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-864 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-865 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-866 9XXX which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-868 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-869 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-873 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-874 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-875 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-877 6XXX which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-881 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-882 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-883 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-885 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-886 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-887 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-888 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-889 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-890 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-891 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-895 0XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-980 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX MO
— 417-994 0XXX3XXX4XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 WALNUT GRV MO

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.