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
T-MOBILE USA, INC. 95
ONVOY, LLC - WA 72
NEW CINGULAR WIRELESS PCS, LLC 58
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 57
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
— 206-341 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
— 206-347 2XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BAINBDG IS WA
— 206-349 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-350 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-351 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-352 not yet reported which blocks → QWEST CORPORATION 9638 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
— 206-357 1XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 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
— 206-369 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-370 0XXX1XXX2XXX4XXX9XXX which blocks → QWEST CORPORATION 9638 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
— 206-373 1XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-374 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-375 6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-376 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-377 9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-378 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-380 none assigned yet which blocks → T-MOBILE USA, INC. 6529 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
— 206-383 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-384 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
— 206-386 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-387 4XXX which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-388 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
— 206-389 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-390 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-391 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-394 not yet reported which blocks → QWEST CORPORATION 9638 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

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.