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
— 206-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST WA
— 206-559 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-563 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-564 not yet reported which blocks → WA
— 206-566 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-567 1XXX2XXX3XXX7XXX8XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 VASHON WA
— 206-568 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-569 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RICHMNDBCH WA
— 206-570 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 SEATTLE WA
— 206-571 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-574 8XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-575 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-576 not yet reported which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 SEATTLE WA
— 206-577 none assigned yet which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
— 206-578 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 DES MOINES WA
— 206-579 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-581 0–9 XXXall 10 · 2 holders which blocks → CORETEL WASHINGTON, INC. - WA 453J SEATTLE WA
— 206-583 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-585 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-587 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-592 2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 206-595 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-598 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-599 9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-600 0XXX1XXX2XXX3XXX7XXX8XXX9XXX which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-601 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-603 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H VASHON WA
— 206-604 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-605 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-607 6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
— 206-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 206-612 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-613 9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-615 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-616 not yet reported which blocks → RINGSQUARED TELECOM LLC 577F SEATTLE WA
— 206-617 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-618 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-619 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-621 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-622 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-623 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-624 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-625 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-626 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-628 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-629 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 RICHMNDBCH WA
— 206-632 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-633 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-634 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-642 not yet reported which blocks → SPOK, INC. 6630 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.