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 479
SOUTHWESTERN BELL 88
SOUTHWESTERN BELL TELEPHONE COMPANY - AR 5
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
— 479-571 0XXX which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-575 not yet reported which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-582 4XXX which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-587 not yet reported which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-616 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 ROGERS AR
— 479-619 none assigned yet which blocks → SOUTHWESTERN BELL 9533 ROGERS AR
— 479-621 none assigned yet which blocks → SOUTHWESTERN BELL 9533 ROGERS AR
— 479-631 not yet reported which blocks → SOUTHWESTERN BELL 9533 ROGERS AR
— 479-633 0XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ROGERS AR
— 479-636 not yet reported which blocks → SOUTHWESTERN BELL 9533 ROGERS AR
— 479-646 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-648 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-649 6XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-659 1XXX2XXX4XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ROGERS AR
— 479-684 1XXX6XXX7XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-696 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
— 479-709 2XXX3XXX which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-713 0XXX9XXX which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-717 0XXX2XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
— 479-718 6XXX which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-750 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
— 479-751 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
— 479-755 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-756 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
— 479-757 0XXX9XXX which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
— 479-770 3XXX4XXX5XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
— 479-782 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-783 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-784 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-785 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-787 3XXX8XXX which blocks → SOUTHWESTERN BELL 9533 GRAVETTE AR
— 479-788 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-789 0XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 HINDSVILLE AR
— 479-820 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
— 479-855 not yet reported which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
— 479-856 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-872 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
— 479-876 0XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
— 479-925 0XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ROGERS AR
— 479-927 6XXX which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
— 479-936 none assigned yet which blocks → SOUTHWESTERN BELL 9533 ROGERS AR
— 479-973 3XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-986 not yet reported which blocks → SOUTHWESTERN BELL 9533 ROGERS AR

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.