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
— 509-797 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 QUINCY WA
— 509-798 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 732J SPOKANE WA
— 509-800 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELNYX LLC 073H CLARKSTON WA
— 509-802 0–9 XXXall 10 · 4 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J KENNEWICK WA
— 509-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 509-818 0–9 XXXall 10 · 5 holders which blocks → NATIVE NETWORK, INC. 483H SPOKANE WA
— 509-826 not yet reported which blocks → QWEST CORPORATION 9638 OMAK WA
— 509-829 1XXX4XXX · 2 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 TOPPENISH WA
— 509-830 none assigned yet which blocks → UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
— 509-831 2XXX3XXX4XXX which blocks → UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
— 509-832 4XXX8XXX · 2 holders which blocks → UNITED STATES CELLULAR - WA 6270 PROSSER WA
— 509-834 0XXX1XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 YAKIMA WA
— 509-835 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-836 1XXX7XXX9XXX · 3 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 SUNNYSIDE WA
— 509-837 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 SUNNYSIDE WA
— 509-838 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-839 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 SUNNYSIDE WA
— 509-840 6XXX7XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SUNNYSIDE WA
— 509-842 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → AT&T - LOCAL 7421 SPOKANE WA
— 509-843 4XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9638 POMEROY WA
— 509-846 3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 OMAK WA
— 509-847 0XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
— 509-848 8XXX9XXX which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 HARRAH WA
— 509-849 none assigned yet which blocks → INLAND TEL CO 2423 PRESCOTT WA
— 509-851 3XXX6XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 PASCO WA
— 509-852 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9638 CLE ELUM WA
— 509-853 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 YAKIMA WA
— 509-854 4XXX5XXX8XXX9XXX · 2 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 GRANGER WA
— 509-856 5XXX6XXX8XXX · 2 holders which blocks → CONSOLIDATED COMMUNICATIONS OF WASHINGTON COMPANY 2412 ELLENSBURG WA
— 509-857 3XXX which blocks → CONSOLIDATED COMMUNICATIONS OF WASHINGTON COMPANY 2412 ELLENSBURG WA
— 509-859 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → UNITED STATES CELLULAR - WA 6270 ELLENSBURG WA
— 509-860 3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WENATCHEE WA
— 509-861 3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - WA 483E OMAK WA
— 509-863 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
— 509-865 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 TOPPENISH WA
— 509-868 0XXX3XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-869 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-870 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - WA 483E KENNEWICK WA
— 509-872 0XXX2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4321 GARRISON WA
— 509-874 1XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 WHITE SWAN WA
— 509-875 1XXX5XXX7XXX8XXX · 3 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 PATERSON WA
— 509-876 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K WALLAWALLA WA
— 509-877 8XXX9XXX · 2 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 WAPATO WA
— 509-878 2XXX3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 PALOUSE WA
— 509-879 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-880 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 SPOKANE WA
— 509-881 0XXX1XXX4XXX5XXX7XXX8XXX9XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE WA
— 509-882 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 GRANDVIEW WA
— 509-884 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE WA
— 509-886 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.