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
— 206-286 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-287 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-288 3XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
— 206-289 0XXX1XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 RICHMNDBCH WA
— 206-290 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-291 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-292 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-293 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-295 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 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
— 206-299 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-300 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 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
— 206-308 0–9 XXXall 10 · 2 holders which blocks → CORETEL WASHINGTON, INC. - WA 453J SEATTLE WA
— 206-309 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-310 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 206-312 not yet reported which blocks → ONVOY, LLC - WA 483E BAINBDG IS WA
— 206-313 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-314 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-315 1XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
— 206-316 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H SEATTLE WA
— 206-318 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-319 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BAINBDG IS WA
— 206-320 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-321 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 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
— 206-327 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 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
— 206-330 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
— 206-331 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-332 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-333 not yet reported which blocks → ONVOY, LLC - WA 483E 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
— 206-336 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
— 206-337 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-338 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-339 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-340 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.