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
2018-04-24 360-585 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 CRYSTAL MT WA
2016-01-06 360-745 0–9 XXXall 10 · 5 holders which blocks → QWEST CORPORATION 9638 PORTLUDLOW WA
2011-12-27 360-729 0–9 XXXall 10 · 3 holders which blocks → QWEST CORPORATION 9638 VANCOUVER WA
2009-10-22 360-524 0–9 XXXall 10 · 5 holders which blocks → QWEST CORPORATION 9638 VANCOUVER WA
2008-11-06 360-827 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9638 CENTRALIA WA
2008-07-03 360-744 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-204 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 SILVERDALE WA
— 360-212 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-236 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-253 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-254 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-256 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-260 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-262 1XXX2XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9638 CHEHALIS WA
— 360-266 2XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9638 CHEHALIS WA
— 360-273 not yet reported which blocks → QWEST CORPORATION 9638 ROCHESTER WA
— 360-274 not yet reported which blocks → QWEST CORPORATION 9638 CASTLEROCK WA
— 360-275 not yet reported which blocks → QWEST CORPORATION 9638 BELFAIR WA
— 360-277 1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 BELFAIR WA
— 360-289 not yet reported which blocks → QWEST CORPORATION 9638 COPALIS WA
— 360-307 not yet reported which blocks → QWEST CORPORATION 9638 SILVERDALE WA
— 360-308 not yet reported which blocks → QWEST CORPORATION 9638 SILVERDALE WA
— 360-330 4XXX which blocks → QWEST CORPORATION 9638 CENTRALIA WA
— 360-337 0XXX9XXX which blocks → QWEST CORPORATION 9638 SILVERDALE WA
— 360-344 2XXX5XXX6XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 PTTOWNSEND WA
— 360-352 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-357 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-373 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-377 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-379 not yet reported which blocks → QWEST CORPORATION 9638 PTTOWNSEND WA
— 360-385 not yet reported which blocks → QWEST CORPORATION 9638 PTTOWNSEND WA
— 360-405 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-407 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-412 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-413 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-414 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-415 not yet reported which blocks → QWEST CORPORATION 9638 BREMERTON WA
— 360-417 not yet reported which blocks → QWEST CORPORATION 9638 PT ANGELES WA
— 360-418 not yet reported which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-423 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-425 not yet reported which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-426 not yet reported which blocks → QWEST CORPORATION 9638 SHELTON WA
— 360-427 not yet reported which blocks → QWEST CORPORATION 9638 SHELTON WA
— 360-432 4XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 SHELTON WA
— 360-437 3XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 PORTLUDLOW WA
— 360-438 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA WA
— 360-442 0XXX1XXX3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 LONGVIEW WA
— 360-449 2XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 VANCOUVER WA
— 360-452 not yet reported which blocks → QWEST CORPORATION 9638 PT ANGELES WA
— 360-455 not yet reported which blocks → QWEST CORPORATION 9638 OLYMPIA 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.