NumberResearch Membership · Data 09/24/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/24/2026

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, all time — NPA 509
CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 37
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
— 509-234 1XXX4XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CONNELL WA
— 509-235 not yet reported which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CHENEY WA
— 509-236 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 EDWALLTYLR WA
— 509-239 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 EDWALLTYLR WA
— 509-245 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 SPANGLE WA
— 509-253 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 HARRINGTON WA
— 509-257 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 SPRAGUE WA
— 509-265 3XXX6XXX7XXX8XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CONNELL WA
— 509-266 0XXX2XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 MATHEWSCOR WA
— 509-269 2XXX3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CONNELL WA
— 509-282 0XXX2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CONNELL WA
— 509-297 2XXX3XXX7XXX8XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 MATHEWSCOR WA
— 509-299 0XXX8XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 MEDICAL LK WA
— 509-345 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 WILSON CRK WA
— 509-346 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 OTHELLO WA
— 509-359 0XXX1XXX5XXX8XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CHENEY WA
— 509-399 0XXX3XXX4XXX7XXX9XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 STARBUCK WA
— 509-559 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CHENEY WA
— 509-632 2XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 COULEECITY WA
— 509-634 0XXX1XXX5XXX6XXX9XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 NESPELEM WA
— 509-636 1XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CRESTON WA
— 509-639 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 ALMIRA WA
— 509-646 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 WASHTUCNA WA
— 509-647 1XXX7XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 WILBUR WA
— 509-659 2XXX7XXX8XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 RITZVILLE WA
— 509-677 0XXX1XXX2XXX4XXX6XXX7XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 LIND WA
— 509-722 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CHEWELAH WA
— 509-725 6XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 DAVENPORT WA
— 509-738 0XXX1XXX5XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 KETTLE FLS WA
— 509-749 0XXX3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 EUREKA WA
— 509-796 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 REARDAN WA
— 509-887 4XXX7XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 RITZVILLE WA
— 509-935 1XXX2XXX3XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CHEWELAH WA
— 509-937 not yet reported which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 CHEWELAH WA
— 509-982 1XXX6XXX7XXX8XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 ODESSA 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/24/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.