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
— 509-737 4XXX7XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KENNEWICK WA
— 509-738 0XXX1XXX5XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 KETTLE FLS WA
— 509-739 2XXX3XXX · 2 holders which blocks → CORETEL WASHINGTON, INC. - WA 453J ALMIRA WA
— 509-742 0XXX which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-743 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 732J SPOKANE WA
— 509-744 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-745 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 DOUGLASCO WA
— 509-747 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-748 1XXX4XXX7XXX8XXX · 4 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 DALLESPORT WA
— 509-749 0XXX3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 EUREKA WA
— 509-750 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MOSES LAKE WA
— 509-751 none assigned yet which blocks → QWEST CORPORATION 9638 CLARKSTON WA
— 509-752 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-753 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-754 not yet reported which blocks → QWEST CORPORATION 9638 EPHRATA WA
— 509-755 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
— 509-756 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-757 not yet reported which blocks → ONVOY, LLC - WA 483E SPOKANE WA
— 509-758 not yet reported which blocks → QWEST CORPORATION 9638 CLARKSTON WA
— 509-760 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MOSES LAKE WA
— 509-761 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - WA 483E MOSES LAKE WA
— 509-762 not yet reported which blocks → QWEST CORPORATION 9638 MOSES LAKE WA
— 509-763 6XXX7XXX8XXX9XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE WA
— 509-764 not yet reported which blocks → QWEST CORPORATION 9638 MOSES LAKE WA
— 509-765 not yet reported which blocks → QWEST CORPORATION 9638 MOSES LAKE WA
— 509-766 not yet reported which blocks → QWEST CORPORATION 9638 MOSES LAKE WA
— 509-767 6XXX7XXX · 2 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 DALLESPORT WA
— 509-768 not yet reported which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-769 1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CLARKSTON WA
— 509-770 0XXX2XXX3XXX4XXX5XXX9XXX · 2 holders which blocks → INLAND CELLULAR LLC 1477 MOSES LAKE WA
— 509-771 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MOSES LAKE WA
— 509-772 1XXX2XXX6XXX7XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 GOLDENDALE WA
— 509-773 8XXX which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 GOLDENDALE WA
— 509-775 1XXX4XXX6XXX7XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 REPUBLIC WA
— 509-777 7XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
— 509-779 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 CURLEW WA
— 509-780 0XXX3XXX4XXX5XXX6XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 CLARKSTON WA
— 509-781 3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PROSSER WA
— 509-782 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE WA
— 509-783 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KENNEWICK WA
— 509-784 none assigned yet which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 WENATCHEE WA
— 509-785 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 GEORGE WA
— 509-786 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 PROSSER WA
— 509-787 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 QUINCY WA
— 509-788 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 PROSSER WA
— 509-789 0XXX which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 SPOKANE WA
— 509-790 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J SUNNYSIDE WA
— 509-793 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 MOSES LAKE WA
— 509-794 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMMIO, LLC 939H QUINCY WA
— 509-796 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 REARDAN 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.