NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 509
QWEST CORPORATION 132
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
— 509-466 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-467 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-468 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-469 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-473 0XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-474 0XXX1XXX9XXX which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-476 7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9638 OROVILLE WA
— 509-482 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-483 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-484 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-487 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-488 not yet reported which blocks → QWEST CORPORATION 9638 OTHELLO WA
— 509-489 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-494 2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-495 1XXX which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-522 not yet reported which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-524 3XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-525 not yet reported which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-526 not yet reported which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-527 not yet reported which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-529 not yet reported which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-532 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-533 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-534 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-535 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-536 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-542 5XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9638 PASCO WA
— 509-543 not yet reported which blocks → QWEST CORPORATION 9638 PASCO WA
— 509-544 not yet reported which blocks → QWEST CORPORATION 9638 PASCO WA
— 509-545 not yet reported which blocks → QWEST CORPORATION 9638 PASCO WA
— 509-546 none assigned yet which blocks → QWEST CORPORATION 9638 PASCO WA
— 509-547 not yet reported which blocks → QWEST CORPORATION 9638 PASCO WA
— 509-568 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-573 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-574 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-575 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-576 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-577 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-622 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-623 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-624 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-625 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-626 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-633 4XXX which blocks → QWEST CORPORATION 9638 COULEE DAM WA
— 509-656 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 CLE ELUM WA
— 509-674 none assigned yet which blocks → QWEST CORPORATION 9638 CLE ELUM WA
— 509-684 not yet reported which blocks → QWEST CORPORATION 9638 COLVILLE WA
— 509-685 3XXX4XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9638 COLVILLE WA
— 509-732 2XXX3XXX5XXX7XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 NORTHPORT WA
— 509-742 0XXX which blocks → QWEST CORPORATION 9638 SPOKANE 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.