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
— 206-398 9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-399 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-403 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
— 206-404 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-405 0XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-406 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-407 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
— 206-408 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 VASHON WA
— 206-409 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-410 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 206-412 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-415 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-416 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-417 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-418 6XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-419 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-421 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-423 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-424 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-425 not yet reported which blocks → WA
— 206-426 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-427 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-428 3XXX6XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
— 206-429 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DES MOINES WA
— 206-431 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-433 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-436 4XXX9XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
— 206-437 8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-438 3XXX4XXX7XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
— 206-439 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-440 6XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-441 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-442 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-443 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-444 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-445 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-447 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-448 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-449 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-450 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-456 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
— 206-457 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-459 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-461 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-462 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-463 not yet reported which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 VASHON WA
— 206-464 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-465 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-466 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 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.