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
— 509-887 4XXX7XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 RITZVILLE WA
— 509-889 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 SPOKANE WA
— 509-891 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-892 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-893 5XXX which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-894 1XXX8XXX which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 MABTON WA
— 509-895 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 YAKIMA WA
— 509-896 4XXX6XXX7XXX · 3 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 MABTON WA
— 509-897 2XXX3XXX5XXX8XXX which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-898 not yet reported which blocks → QWEST CORPORATION 9638 MOSES LAKE WA
— 509-899 6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ELLENSBURG WA
— 509-901 5XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 YAKIMA WA
— 509-910 none assigned yet which blocks → T-MOBILE USA, INC. 6529 YAKIMA WA
— 509-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 509-921 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-922 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-923 3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9638 PATEROS WA
— 509-924 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-925 not yet reported which blocks → CONSOLIDATED COMMUNICATIONS OF WASHINGTON COMPANY 2412 ELLENSBURG WA
— 509-926 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-927 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-928 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-929 8XXX9XXX which blocks → UNITED STATES CELLULAR - WA 6270 ELLENSBURG WA
— 509-930 none assigned yet which blocks → UNITED STATES CELLULAR - WA 6270 YAKIMA WA
— 509-931 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
— 509-932 1XXX2XXX3XXX6XXX7XXX9XXX · 3 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 MATTAWA WA
— 509-933 not yet reported which blocks → CONSOLIDATED COMMUNICATIONS OF WASHINGTON COMPANY 2412 ELLENSBURG WA
— 509-935 1XXX2XXX3XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CHEWELAH WA
— 509-936 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 CHEWELAH WA
— 509-937 not yet reported which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CHEWELAH WA
— 509-939 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
— 509-941 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → UNITED STATES CELLULAR - WA 6270 YAKIMA WA
— 509-942 4XXX5XXX8XXX9XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 RICHLAND WA
— 509-943 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 RICHLAND WA
— 509-944 0XXX1XXX4XXX5XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-945 none assigned yet which blocks → UNITED STATES CELLULAR - WA 6270 YAKIMA WA
— 509-946 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 RICHLAND WA
— 509-947 none assigned yet which blocks → UNITED STATES CELLULAR - WA 6270 KENNEWICK WA
— 509-948 none assigned yet which blocks → UNITED STATES CELLULAR - WA 6270 KENNEWICK WA
— 509-949 none assigned yet which blocks → UNITED STATES CELLULAR - WA 6270 YAKIMA WA
— 509-950 not yet reported which blocks → WA
— 509-951 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
— 509-952 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 YAKIMA WA
— 509-953 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
— 509-954 4XXX5XXX6XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
— 509-958 not yet reported which blocks → WA
— 509-959 not yet reported which blocks → WA
— 509-961 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 YAKIMA WA
— 509-962 not yet reported which blocks → CONSOLIDATED COMMUNICATIONS OF WASHINGTON COMPANY 2412 ELLENSBURG WA
— 509-963 not yet reported which blocks → CONSOLIDATED COMMUNICATIONS OF WASHINGTON COMPANY 2412 ELLENSBURG 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.