AS7973 — MAYO

AS7973 announces 16 IPv4 prefixes covering 64,000 addresses and 0 IPv6 prefixes.

About this network

MAYO is the Autonomous System of the Mayo Foundation for Medical Education and Research — the legal entity behind Mayo Clinic, the nonprofit academic medical center headquartered in Rochester, Minnesota.

What it's used for

• Mayo Clinic's enterprise network: hospitals, clinics, research institutes and the Mayo Clinic College of Medicine and Science, across its Minnesota, Arizona and Florida campuses and its regional health system.
• Clinical and corporate IT. rDNS across the space is uniformly mayo.edu — router-128.mayo.edu and router2-128.mayo.edu for edge routing, plus internal-looking application and management hosts.

Notable

• Despite the .edu domain and the "Medical Education and Research" name, this behaves as a large institutional enterprise network, not a campus ISP and not a public research network. There are no subscriber pools of any kind.
• It announces 129.176.0.0/16, a legacy Class B, deaggregated into /19s — roughly 65,000 addresses. Traffic from this AS is clinicians, researchers and staff on Mayo's own estate, and its public-facing patient-portal and web presence.
• Healthcare networks of this size are heavily segmented and egress through enterprise proxies, so outbound addresses are shared by very large numbers of users.

Interesting

• Mayo has held the AS number since 1997, and its .edu domain reflects a genuine degree-granting medical school rather than a marketing choice.

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

Announced prefixes

• 129.176.0.0/20
• 129.176.16.0/21
• 129.176.24.0/23
• 129.176.26.0/24
• 129.176.28.0/22
• 129.176.32.0/19
• 129.176.64.0/18
• 129.176.128.0/18
• 129.176.192.0/20
• 129.176.212.0/22
• 129.176.216.0/21
• 129.176.224.0/20
• 129.176.241.0/24
• 129.176.242.0/23
• 129.176.244.0/22
• 129.176.248.0/21

Upstream networks

• AS32787 Akamai Technologies, Inc.
• AS15830 Equinix (EMEA) Acquisition Enterprises B.V.
• AS3356 Level 3 Parent, LLC
• AS6461 Zayo Bandwidth
• AS57 University of Minnesota

Adjacent networks

• AS32787 Akamai Technologies, Inc.
• AS15830 Equinix (EMEA) Acquisition Enterprises B.V.
• AS3356 Level 3 Parent, LLC
• AS6461 Zayo Bandwidth
• AS57 University of Minnesota