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
— 405-794 not yet reported which blocks → SOUTHWESTERN BELL 9533 MOORE OK
— 405-798 not yet reported which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-799 not yet reported which blocks → SOUTHWESTERN BELL 9533 MOORE OK
— 405-810 5XXX6XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-815 0XXX1XXX3XXX4XXX7XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-840 not yet reported which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-841 not yet reported which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-842 not yet reported which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-843 not yet reported which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-844 not yet reported which blocks → SOUTHWESTERN BELL 9533 EDMOND OK
— 405-848 not yet reported which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-858 0XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-865 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 CARNEY OK
— 405-869 4XXX6XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 MIDWEST CY OK
— 405-872 2XXX6XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 NOBLE OK
— 405-878 2XXX which blocks → SOUTHWESTERN BELL 9533 SHAWNEE OK
— 405-879 0XXX1XXX which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-895 not yet reported which blocks → SOUTHWESTERN BELL 9533 MOORE OK
— 405-912 not yet reported which blocks → SOUTHWESTERN BELL 9533 MOORE OK
— 405-917 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-936 4XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-942 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-943 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-944 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 CROMWELL OK
— 405-945 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-946 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-947 none assigned yet which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-948 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-949 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-951 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-954 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-962 5XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-971 4XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-972 3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-973 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-974 0XXX1XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-979 0XXX3XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY 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.