AS4583 — THOMSON-REUTERS

AS4583 announces 6 IPv4 prefixes covering 5,376 addresses and 0 IPv6 prefixes.

About this network

AS4583 (THOMSON-REUTERS) is registered to West Publishing Corporation, the legal-publishing business behind Westlaw and now part of Thomson Reuters. Its main campus is in Eagan, Minnesota.

What it's used for

Corporate and product infrastructure for Thomson Reuters' legal business: the systems and internet-facing services behind its research and publishing platforms, plus staff networks.

Notable

• Enterprise space belonging to a large information-services company, not a service provider network.
• The registry keeps the historic West Publishing corporate entity as the holder while the AS handle carries the modern parent's name, which is why lookups on this number can show either brand.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 155.46.136.0/22
• 155.46.144.0/22
• 155.46.152.0/23
• 155.46.156.0/23
• 155.46.165.0/24
• 155.46.168.0/21

Upstream networks

• AS3356 Level 3 Parent, LLC
• AS2686 AT&T Enterprises, LLC
• AS7018 AT&T Enterprises, LLC
• AS6461 Zayo Bandwidth

Adjacent networks

• AS3356 Level 3 Parent, LLC
• AS2686 AT&T Enterprises, LLC
• AS7018 AT&T Enterprises, LLC
• AS6461 Zayo Bandwidth