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 405
SOUTHWESTERN BELL 237
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
— 405-684 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-685 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-686 3XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-688 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-691 9XXX which blocks → SOUTHWESTERN BELL 9533 MOORE OK
— 405-692 not yet reported which blocks → SOUTHWESTERN BELL 9533 MOORE OK
— 405-707 not yet reported which blocks → SOUTHWESTERN BELL 9533 STILLWATER OK
— 405-713 3XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-715 not yet reported which blocks → SOUTHWESTERN BELL 9533 EDMOND OK
— 405-717 not yet reported which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-720 not yet reported which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-721 not yet reported which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-722 not yet reported which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-728 6XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-730 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-732 not yet reported which blocks → SOUTHWESTERN BELL 9533 MIDWEST CY OK
— 405-733 not yet reported which blocks → SOUTHWESTERN BELL 9533 MIDWEST CY OK
— 405-734 not yet reported which blocks → SOUTHWESTERN BELL 9533 MIDWEST CY OK
— 405-736 not yet reported which blocks → SOUTHWESTERN BELL 9533 MIDWEST CY OK
— 405-737 not yet reported which blocks → SOUTHWESTERN BELL 9533 MIDWEST CY OK
— 405-739 not yet reported which blocks → SOUTHWESTERN BELL 9533 MIDWEST CY OK
— 405-741 9XXX which blocks → SOUTHWESTERN BELL 9533 MIDWEST CY OK
— 405-742 none assigned yet which blocks → SOUTHWESTERN BELL 9533 STILLWATER OK
— 405-743 not yet reported which blocks → SOUTHWESTERN BELL 9533 STILLWATER OK
— 405-744 not yet reported which blocks → SOUTHWESTERN BELL 9533 STILLWATER OK
— 405-745 0XXX which blocks → SOUTHWESTERN BELL 9533 WHEATLAND OK
— 405-747 2XXX3XXX which blocks → SOUTHWESTERN BELL 9533 STILLWATER OK
— 405-748 0XXX1XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-749 8XXX which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-751 not yet reported which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-752 not yet reported which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-753 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-755 not yet reported which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-767 0XXX4XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-769 not yet reported which blocks → SOUTHWESTERN BELL 9533 NICOMAPARK OK
— 405-771 0XXX6XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SPENCER OK
— 405-773 0XXX which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-775 0XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-779 4XXX9XXX which blocks → SOUTHWESTERN BELL 9533 CHICKASHA OK
— 405-780 2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 STILLWATER OK
— 405-782 8XXX which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-783 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BYARS OK
— 405-785 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ALEX OK
— 405-786 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WELEETKA OK
— 405-787 not yet reported which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-789 not yet reported which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-790 not yet reported which blocks → SOUTHWESTERN BELL 9533 MOORE OK
— 405-791 6XXX which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-792 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-793 not yet reported which blocks → SOUTHWESTERN BELL 9533 MOORE OK

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.