NumberResearch Membership · Data 09/21/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

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 206
T-MOBILE USA, INC. 95
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
— 206-293 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-313 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-334 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-335 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-349 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-353 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-354 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-355 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-356 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-371 2XXX3XXX4XXX which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-372 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-376 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-380 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-383 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-387 4XXX which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-391 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-396 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-397 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-412 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-423 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-466 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-501 0XXX2XXX3XXX4XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-551 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-571 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-579 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-650 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-679 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-683 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-730 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-769 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-778 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-779 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-786 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-793 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-841 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-850 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-851 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-852 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-853 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-854 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-856 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-883 3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-898 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-931 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-941 4XXX which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.