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
— 206-467 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-469 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-470 9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-478 none assigned yet which blocks → METROPCS, INC. 5562 SEATTLE WA
— 206-479 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-484 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-490 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-491 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-493 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SEATTLE WA
— 206-494 6XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
— 206-495 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-496 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-498 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-499 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-500 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-501 0XXX2XXX3XXX4XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-504 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-506 0XXX1XXX2XXX4XXX · 4 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-508 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
— 206-509 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-510 none assigned yet which blocks → METROPCS, INC. 5562 SEATTLE WA
— 206-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 206-515 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-516 1XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-517 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-520 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-521 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-522 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-523 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-524 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-525 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-526 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-527 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-528 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-529 3XXX4XXX5XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-533 3XXX4XXX5XXX7XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 RICHMNDBCH WA
— 206-534 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-540 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-541 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-542 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 RICHMNDBCH WA
— 206-543 not yet reported which blocks → RINGSQUARED TELECOM LLC 577F SEATTLE WA
— 206-544 none assigned yet which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-545 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-546 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 RICHMNDBCH WA
— 206-547 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-548 4XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-550 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-551 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-553 9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-554 1XXX9XXX · 2 holders 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.