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
2026-08-28 509-801 0XXX1XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 YAKIMA WA
2026-07-02 509-729 0XXX6XXX · 2 holders which blocks → ACCELERATE NETWORKS LLC 147L WENATCHEE WA
2026-05-11 509-909 0XXX9XXX · 2 holders which blocks → EXIANT COMMUNICATIONS LLC 114J PULLMAN WA
2026-03-30 509-719 7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WAPATO WA
2026-01-08 509-718 9XXX which blocks → T-MOBILE USA, INC. 6529 ELLENSBURG WA
2025-10-23 509-716 0XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 QUINCY WA
2025-08-29 509-709 0XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PASCO WA
2025-08-19 509-708 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 ELLENSBURG WA
2025-06-27 509-706 0XXX1XXX5XXX6XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KENNEWICK WA
2025-04-18 509-702 0XXX1XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 EPHRATA WA
2025-01-07 509-541 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
2024-12-26 509-917 0XXX which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F REARDAN WA
2024-12-23 509-705 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ELLENSBURG WA
2024-11-26 509-799 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → LIVEWIRE TELECOM LLC 048L SPOKANE WA
2024-11-26 509-938 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 YAKIMA WA
2024-11-18 509-704 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WALLAWALLA WA
2024-08-20 509-618 0XXX1XXX · 2 holders which blocks → WIDE VOICE, LLC - WA 707G CHENEY WA
2024-07-30 509-437 0–9 XXXall 10 · 5 holders which blocks → LEAP TELECOM, LLC 616J SPOKANE WA
2024-06-08 509-617 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELLENSBURG WA
2024-04-15 509-614 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 KENNEWICK WA
2024-03-18 509-613 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
2024-03-05 509-604 0XXX4XXX5XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 RICHLAND WA
2023-07-12 509-791 0XXX1XXX · 2 holders which blocks → VOIP INNOVATIONS, LLC 597F GRANDVIEW WA
2023-04-03 509-825 1XXX2XXX3XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J MEDICAL LK WA
2023-03-17 509-360 0–9 XXXall 10 · 5 holders which blocks → ZIPLY FIBER NORTHWEST LLC DBA ZIPLY FIBER 427K WALLAWALLA WA
2022-10-21 509-268 0–9 XXXall 10 · 3 holders which blocks → ZIPLY FIBER NORTHWEST LLC DBA ZIPLY FIBER 427K YAKIMA WA
2022-10-19 509-273 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELLENSBURG WA
2022-10-03 509-296 0XXX1XXX2XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PULLMAN WA
2022-09-30 509-746 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2022-09-27 509-509 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E YAKIMA WA
2022-09-08 509-224 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E CHENEY WA
2022-08-09 509-298 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J MOSES LAKE WA
2022-08-04 509-425 0–9 XXXall 10 · 3 holders which blocks → HD CARRIER LLC 321J SPOKANE WA
2022-08-02 509-920 0XXX6XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CHEWELAH WA
2022-07-01 509-652 0XXX2XXX3XXX4XXX5XXX which blocks → ONVOY, LLC - WA 483E SPRINGDALE WA
2022-05-23 509-206 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 CLARKSTON WA
2022-02-16 509-564 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 DEER PARK WA
2021-12-16 509-970 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SPOKANE WA
2021-11-17 509-986 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELLENSBURG WA
2021-11-03 509-208 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2021-10-01 509-603 0–9 XXXwhole prefix which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2021-09-15 509-514 0–9 XXXall 10 · 3 holders which blocks → TDS METROCOM, LLC 520K SPOKANE WA
2021-04-16 509-712 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SUNNYSIDE WA
2021-03-02 509-610 0XXX1XXX2XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 COLFAX WA
2021-03-02 509-616 0–9 XXXall 10 · 2 holders which blocks → IP HORIZON LLC 515J SPOKANE WA
2021-02-16 509-516 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WALLAWALLA WA
2021-02-01 509-918 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E SPOKANE WA
2021-01-31 509-883 3XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H WENATCHEE WA
2021-01-28 509-609 0–9 XXXall 10 · 4 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J SPOKANE WA
2021-01-11 509-517 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 YAKIMA 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.