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
— 405-319 0XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-321 not yet reported which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-322 5XXX6XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-324 not yet reported which blocks → SOUTHWESTERN BELL 9533 YUKON OK
— 405-325 not yet reported which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-329 not yet reported which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-330 not yet reported which blocks → SOUTHWESTERN BELL 9533 EDMOND OK
— 405-332 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 STILLWATER OK
— 405-340 not yet reported which blocks → SOUTHWESTERN BELL 9533 EDMOND OK
— 405-341 not yet reported which blocks → SOUTHWESTERN BELL 9533 EDMOND OK
— 405-348 not yet reported which blocks → SOUTHWESTERN BELL 9533 EDMOND OK
— 405-350 not yet reported which blocks → SOUTHWESTERN BELL 9533 YUKON OK
— 405-352 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 MINCO OK
— 405-354 not yet reported which blocks → SOUTHWESTERN BELL 9533 YUKON OK
— 405-356 0XXX3XXX5XXX6XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WELLSTON OK
— 405-359 not yet reported which blocks → SOUTHWESTERN BELL 9533 EDMOND OK
— 405-360 not yet reported which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-364 not yet reported which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-366 not yet reported which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-372 not yet reported which blocks → SOUTHWESTERN BELL 9533 STILLWATER OK
— 405-373 6XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 PIEDMONT OK
— 405-374 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 MAUD OK
— 405-376 not yet reported which blocks → SOUTHWESTERN BELL 9533 MUSTANG OK
— 405-377 9XXX which blocks → SOUTHWESTERN BELL 9533 STILLWATER OK
— 405-378 1XXX2XXX4XXX5XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 MOORE OK
— 405-379 0XXX which blocks → SOUTHWESTERN BELL 9533 HOLDENVL OK
— 405-380 1XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SEMINOLE OK
— 405-381 0XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 TUTTLE OK
— 405-382 not yet reported which blocks → SOUTHWESTERN BELL 9533 SEMINOLE OK
— 405-383 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WANETTE OK
— 405-385 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 STILLWATER OK
— 405-395 2XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SHAWNEE OK
— 405-396 4XXX5XXX6XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ARCADIA OK
— 405-419 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-422 0XXX5XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 EL RENO OK
— 405-424 8XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-425 9XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-426 0XXX2XXX5XXX7XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-427 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-433 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 CASHION OK
— 405-440 3XXX which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-447 5XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-452 0XXX2XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 WETUMKA OK
— 405-454 0XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 HARRAH OK
— 405-459 0XXX2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 POCASSET OK
— 405-460 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-466 0XXX5XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 GUTHRIE OK
— 405-471 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 EDMOND OK
— 405-475 not yet reported which blocks → SOUTHWESTERN BELL 9533 BRITTON OK
— 405-478 not yet reported which blocks → SOUTHWESTERN BELL 9533 BRITTON 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.