NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
— 509-964 1XXX3XXX4XXX5XXX6XXX8XXX which blocks → CONSOLIDATED COMMUNICATIONS OF WASHINGTON COMPANY 2412 ELLENSBURG WA
— 509-965 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-966 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-967 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 RICHLAND WA
— 509-968 1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CONSOLIDATED COMMUNICATIONS OF WASHINGTON COMPANY 2412 ELLENSBURG WA
— 509-969 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 YAKIMA WA
— 509-972 6XXX which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-973 1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 4521 WHITSTRAN WA
— 509-976 not yet reported which blocks → WA
— 509-979 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
— 509-980 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 CONNELL WA
— 509-981 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
— 509-982 1XXX6XXX7XXX8XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 ODESSA WA
— 509-984 none assigned yet which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
— 509-985 none assigned yet which blocks → UNITED STATES CELLULAR - WA 6270 YAKIMA WA
— 509-987 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - WA 6270 KENNEWICK WA
— 509-988 1XXX3XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ODESSA WA
— 509-989 8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MOSES LAKE WA
— 509-990 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
— 509-991 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
— 509-992 0–9 XXXall 10 · 3 holders which blocks → TELNYX LLC 073H SPOKANE WA
— 509-993 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
— 509-994 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
— 509-995 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
— 509-996 0XXX1XXX5XXX6XXX7XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 TWISP WA
— 509-997 8XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 TWISP WA
— 509-998 5XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
— 509-999 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.