NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
T-MOBILE USA, INC. 87
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
— 405-204 none assigned yet which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-209 none assigned yet which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-210 none assigned yet which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-212 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-268 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PAULS VLY OK
— 405-269 0XXX5XXX7XXX which blocks → T-MOBILE USA, INC. 6529 STILLWATER OK
— 405-274 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CHICKASHA OK
— 405-314 not yet reported which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-326 not yet reported which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-338 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 STILLWATER OK
— 405-370 2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-408 not yet reported which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-409 none assigned yet which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-410 not yet reported which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-412 not yet reported which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-413 not yet reported which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-414 not yet reported which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-417 none assigned yet which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-472 not yet reported which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-473 not yet reported which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-474 not yet reported which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-476 not yet reported which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-503 2XXX which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-514 2XXX which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-520 none assigned yet which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-706 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-812 2XXX which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-816 none assigned yet which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-819 0XXX which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-821 0XXX which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-822 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-824 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-838 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-921 0XXX which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-922 0XXX which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-923 0XXX which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-924 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.