NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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, last 30 days — NPA 509
NEW CINGULAR WIRELESS PCS, LLC 1
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
— 509-577 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-579 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J KENNEWICK WA
— 509-582 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KENNEWICK WA
— 509-585 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KENNEWICK WA
— 509-586 not yet reported which blocks → ZIPLY FIBER NORTHWEST LLC DBA ZIPLY FIBER 427K KENNEWICK WA
— 509-588 0XXX1XXX7XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BENTONCITY WA
— 509-592 0–9 XXXall 10 · 6 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J PULLMAN WA
— 509-595 6XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 PULLMAN WA
— 509-597 7XXX which blocks → INLAND CELLULAR LLC 1484 UNIONTOWN WA
— 509-599 none assigned yet which blocks → METROPCS, INC. 5562 SPOKANE WA
— 509-607 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ELLENSBURG WA
— 509-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 509-615 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → WAVENATION, LLC 700J ELK-GRNBLF WA
— 509-622 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-623 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-624 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-625 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-626 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-627 8XXX9XXX which blocks → ZIPLY FIBER NORTHWEST LLC DBA ZIPLY FIBER 427K KENNEWICK WA
— 509-628 4XXX5XXX6XXX7XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KENNEWICK WA
— 509-629 5XXX6XXX9XXX · 3 holders which blocks → INLAND CELLULAR LLC 1484 WALLAWALLA WA
— 509-630 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WENATCHEE WA
— 509-631 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 COULEE DAM WA
— 509-632 2XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 COULEECITY WA
— 509-633 4XXX which blocks → QWEST CORPORATION 9638 COULEE DAM WA
— 509-634 0XXX1XXX5XXX6XXX9XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 NESPELEM WA
— 509-635 3XXX4XXX7XXX9XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 GARFIELD WA
— 509-636 1XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CRESTON WA
— 509-639 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 ALMIRA WA
— 509-640 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - WA 483E COLVILLE WA
— 509-641 2XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WILBUR WA
— 509-642 0XXX1XXX6XXX7XXX · 2 holders which blocks → ONVOY, LLC - WA 483E HARRAH WA
— 509-645 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - WA 483E BREWSTER WA
— 509-646 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 WASHTUCNA WA
— 509-647 1XXX7XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 WILBUR WA
— 509-648 8XXX which blocks → ST. JOHN TEL. CO. 2442 ST JOHN WA
— 509-649 not yet reported which blocks → INLAND TEL CO 2423 ROSLYN WA
— 509-650 none assigned yet which blocks → INLAND CELLULAR LLC 1477 RITZVILLE WA
— 509-651 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - WA 483E DEER PARK WA
— 509-653 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 NACHES WA
— 509-654 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 YAKIMA WA
— 509-656 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 CLE ELUM WA
— 509-657 none assigned yet which blocks → PIONEER TEL. CO. 2437 ENDICOTT WA
— 509-658 0XXX3XXX6XXX7XXX8XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 NILE WA
— 509-659 2XXX7XXX8XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 RITZVILLE WA
— 509-660 1XXX2XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 RITZVILLE WA
— 509-661 not yet reported which blocks → ONVOY, LLC - WA 483E WENATCHEE WA
— 509-662 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE WA
— 509-663 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE WA
— 509-664 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE 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.