AS6071 — UNISYS-AS-E

AS6071 announces 14 IPv4 prefixes covering 19,456 addresses and 0 IPv6 prefixes.

About this network

UNISYS-AS-E is one of several autonomous systems run by Unisys Corporation, the American IT services and enterprise-computing company. It carries part of Unisys's own corporate and customer-facing network.

What it's used for

• Corporate connectivity for Unisys itself and for the outsourced IT and managed services it runs on behalf of clients.
• All of its announced space sits inside 129.220.0.0/16, a block registered to Unisys — this is company-owned addressing, not resold or leased space.

Notable

• An enterprise network, not a commercial ISP: the addresses here belong to a single company's infrastructure and hosted client systems.
• Unisys operates a sibling AS, AS6072 (UNISYS-AS-C), and the two split the company's routing rather than representing different businesses.

Interesting

• ARIN registered this number to Unisys in November 1995, in the same sequential run as its sibling — a genuine mid-1990s allocation from the era when large enterprises routinely ran their own AS.
• Unisys traces back to the 1986 merger of Burroughs and Sperry, two of the original mainframe makers, and still supports ClearPath mainframes alongside modern cloud and security services.

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

Announced prefixes

• 129.220.0.0/22
• 129.220.5.0/24
• 129.220.6.0/23
• 129.220.8.0/22
• 129.220.12.0/24
• 129.220.14.0/24
• 129.220.17.0/24
• 129.220.18.0/23
• 129.220.20.0/23
• 129.220.24.0/21
• 129.220.32.0/20
• 129.220.50.0/24
• 129.220.53.0/24
• 129.220.160.0/19

Upstream networks

• AS202 Level 3 Parent, LLC
• AS7018 AT&T Enterprises, LLC
• AS3356 Level 3 Parent, LLC
• AS701 Verizon Business
• AS2688 AT&T Enterprises, LLC

Adjacent networks

• AS202 Level 3 Parent, LLC
• AS7018 AT&T Enterprises, LLC
• AS3356 Level 3 Parent, LLC
• AS701 Verizon Business
• AS2688 AT&T Enterprises, LLC