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 360
QWEST CORPORATION 170
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
— 360-456 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-457 not yet reported which blocks → QWEST CORPORATION 9638 PT ANGELES WA
— 360-459 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-473 3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-475 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-476 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-478 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-479 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-486 4XXX which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-491 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-493 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-501 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-514 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-527 5XXX6XXX which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-532 not yet reported which blocks → QWEST CORPORATION 9638 ABERDEEN WA
— 360-533 not yet reported which blocks → QWEST CORPORATION 9638 ABERDEEN WA
— 360-534 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-537 not yet reported which blocks → QWEST CORPORATION 9638 ABERDEEN WA
— 360-538 not yet reported which blocks → QWEST CORPORATION 9638 ABERDEEN WA
— 360-546 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-565 4XXX5XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 PT ANGELES WA
— 360-566 2XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-570 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-571 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-573 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-574 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-575 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-576 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-577 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-578 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-582 4XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9638 PT ANGELES WA
— 360-586 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-596 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-604 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-613 not yet reported which blocks → QWEST CORPORATION 9638 SILVERDALE WA
— 360-619 2XXX8XXX which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-627 0–9 XXXall 10 · 3 holders which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-636 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-647 not yet reported which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-650 not yet reported which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-662 3XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9638 SILVERDALE WA
— 360-663 4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → QWEST CORPORATION 9638 CRYSTAL MT WA
— 360-664 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-666 not yet reported which blocks → QWEST CORPORATION 9638 BATTLEGRND WA
— 360-667 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9638 BATTLEGRND WA
— 360-671 not yet reported which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-674 0XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-676 not yet reported which blocks → QWEST CORPORATION 9638 WHATCOMCTY WA
— 360-681 not yet reported which blocks → QWEST CORPORATION 9638 PT ANGELES WA
— 360-683 not yet reported which blocks → QWEST CORPORATION 9638 PT ANGELES 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.