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 206
QWEST CORPORATION 243
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
— 206-296 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-297 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-298 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-301 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-302 8XXX9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-303 0XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-306 3XXX4XXX5XXX6XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-318 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-320 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-322 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-323 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-324 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-325 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-326 0XXX1XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-328 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-329 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-332 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-340 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-341 2XXX5XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-342 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-343 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-344 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-345 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-346 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-352 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-358 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-359 0XXX1XXX2XXX5XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-361 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-362 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-363 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-364 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-365 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-366 5XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-367 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-368 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-370 0XXX1XXX2XXX4XXX9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-373 1XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-374 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-377 9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-378 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-381 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-382 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-386 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-389 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-394 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-398 9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-404 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-405 0XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-410 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-416 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA

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.