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
— 509-665 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE WA
— 509-667 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE WA
— 509-668 3XXX6XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WENATCHEE WA
— 509-669 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WENATCHEE WA
— 509-670 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WENATCHEE WA
— 509-671 3XXX4XXX5XXX6XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 NEWPORT WA
— 509-672 0XXX1XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → CENTURYTEL OF COWICHE, INC. DBA CENTURYLINK 2410 RIMROCK WA
— 509-673 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CENTURYTEL OF COWICHE, INC. DBA CENTURYLINK 2410 TIETON WA
— 509-674 none assigned yet which blocks → QWEST CORPORATION 9638 CLE ELUM WA
— 509-675 7XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 COLVILLE WA
— 509-677 0XXX1XXX2XXX4XXX6XXX7XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 LIND WA
— 509-678 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF COWICHE, INC. DBA CENTURYLINK 2410 COWICHE WA
— 509-679 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WENATCHEE WA
— 509-680 5XXX6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 COLVILLE WA
— 509-681 1XXX2XXX3XXX7XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 COULEECITY WA
— 509-682 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE WA
— 509-683 2XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 DOUGLASCO WA
— 509-684 not yet reported which blocks → QWEST CORPORATION 9638 COLVILLE WA
— 509-685 3XXX4XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9638 COLVILLE WA
— 509-686 1XXX5XXX7XXX8XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BRIDGEPORT WA
— 509-687 none assigned yet which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE WA
— 509-688 3XXX4XXX5XXX7XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
— 509-689 4XXX9XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BREWSTER WA
— 509-690 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 COLVILLE WA
— 509-691 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-692 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-693 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-694 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-695 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-696 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-697 not yet reported which blocks → CONSOLIDATED COMMUNICATIONS OF WASHINGTON COMPANY 2412 SELAH WA
— 509-698 2XXX which blocks → CONSOLIDATED COMMUNICATIONS OF WASHINGTON COMPANY 2412 SELAH WA
— 509-700 not yet reported which blocks → WA
— 509-701 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-703 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
— 509-710 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
— 509-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 509-714 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-715 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PULLMAN WA
— 509-721 3XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DAVENPORT WA
— 509-722 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CHEWELAH WA
— 509-725 6XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 DAVENPORT WA
— 509-726 none assigned yet which blocks → ONVOY, LLC - WA 483E WENATCHEE WA
— 509-727 9XXX which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
— 509-728 9XXX which blocks → T-MOBILE USA, INC. 6529 YAKIMA WA
— 509-732 2XXX3XXX5XXX7XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 NORTHPORT WA
— 509-733 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BREWSTER WA
— 509-734 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KENNEWICK WA
— 509-735 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KENNEWICK WA
— 509-736 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KENNEWICK 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.