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
— 206-226 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-227 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-228 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-229 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-230 1XXX2XXX3XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-232 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-233 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-234 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-235 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-236 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-237 not yet reported which blocks → ONVOY, LLC - WA 483E RICHMNDBCH WA
— 206-238 not yet reported which blocks → ONVOY, LLC - WA 483E BAINBDG IS WA
— 206-239 8XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-240 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-241 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-242 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-243 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-244 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-246 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-248 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-250 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-251 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-252 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
— 206-253 not yet reported which blocks → WA
— 206-254 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-255 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-256 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-260 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-261 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-262 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-263 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-264 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-265 0XXX1XXX2XXX3XXX9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-267 8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
— 206-269 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-270 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-271 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-272 0XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-273 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-275 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-276 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-277 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-278 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-279 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-280 2XXX which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-281 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-282 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-283 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-284 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-285 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.