NumberResearch Membership · Data 2026-04

Recent prefix assignments

380 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 2026-04

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Which carriers received which NPA-NXX prefixes, and where. Assignments are initial assignments from NANPA records — because of number portability, the current serving carrier of individual numbers may differ. For finer-grained activity, see the thousands-block view above.

Most active assignees, last 30 days
8X8, INC. 38
ONVOY, LLC - CA 37
NEW CINGULAR WIRELESS PCS, LLC - IL 33
NEW CINGULAR WIRELESS PCS, LLC - DC 30
ONVOY, LLC - TX 18
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-NXXAssigneeOCNRate centerState
206-511 MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
206-515 QWEST CORPORATION 9638 SEATTLE WA
206-516 QWEST CORPORATION 9638 SEATTLE WA
206-517 QWEST CORPORATION 9638 SEATTLE WA
206-520 QWEST CORPORATION 9638 SEATTLE WA
206-521 QWEST CORPORATION 9638 SEATTLE WA
206-522 QWEST CORPORATION 9638 SEATTLE WA
206-523 QWEST CORPORATION 9638 SEATTLE WA
206-524 QWEST CORPORATION 9638 SEATTLE WA
206-525 QWEST CORPORATION 9638 SEATTLE WA
206-526 QWEST CORPORATION 9638 SEATTLE WA
206-527 QWEST CORPORATION 9638 SEATTLE WA
206-528 QWEST CORPORATION 9638 SEATTLE WA
206-529 QWEST CORPORATION 9638 SEATTLE WA
206-533 ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 RICHMNDBCH WA
206-534 SPOK, INC. 6630 SEATTLE WA
206-540 SPOK, INC. 6630 SEATTLE WA
206-541 SPOK, INC. 6630 SEATTLE WA
206-542 ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 RICHMNDBCH WA
206-543 RINGSQUARED TELECOM LLC 577F SEATTLE WA
206-544 QWEST CORPORATION 9638 SEATTLE WA
206-545 QWEST CORPORATION 9638 SEATTLE WA
206-546 ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 RICHMNDBCH WA
206-547 QWEST CORPORATION 9638 SEATTLE WA
206-548 QWEST CORPORATION 9638 SEATTLE WA
206-550 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
206-551 T-MOBILE USA, INC. 6529 SEATTLE WA
206-553 QWEST CORPORATION 9638 SEATTLE WA
206-554 QWEST CORPORATION 9638 SEATTLE WA
206-555 MULTIPLE OCN LISTING MULT DIR ASST WA
206-559 SPOK, INC. 6630 SEATTLE WA
206-563 SPOK, INC. 6630 SEATTLE WA
206-564 WA
206-566 ONVOY, LLC - WA 483E SEATTLE WA
206-567 CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 VASHON WA
206-568 QWEST CORPORATION 9638 SEATTLE WA
206-569 LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RICHMNDBCH WA
206-570 AMERICAN MESSAGING SERVICES, LLC 9748 SEATTLE WA
206-571 T-MOBILE USA, INC. 6529 SEATTLE WA
206-574 QWEST CORPORATION 9638 SEATTLE WA
206-575 QWEST CORPORATION 9638 SEATTLE WA
206-576 LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 SEATTLE WA
206-577 LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
206-578 METROPCS, INC. 5562 DES MOINES WA
206-579 T-MOBILE USA, INC. 6529 SEATTLE WA
206-581 CORETEL WASHINGTON, INC. - WA 453J SEATTLE WA
206-583 QWEST CORPORATION 9638 SEATTLE WA
206-585 QWEST CORPORATION 9638 SEATTLE WA
206-587 QWEST CORPORATION 9638 SEATTLE WA
206-592 QWEST CORPORATION 9638 DES MOINES WA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 2026-04 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.