AS11975 — WM

Network type: education

AS11975 announces 2 IPv4 prefixes covering 131,072 addresses and 0 IPv6 prefixes.

About this network

WM is the campus network of the College of William & Mary in Williamsburg, Virginia, the second-oldest university in the United States. It also carries the Virginia Institute of Marine Science.

What it's used for

• University connectivity. The AS announces roughly 131,000 addresses across two /16s and their more-specifics: 128.239.0.0/16, registered to the College of William and Mary, and 139.70.0.0/16, registered to the Virginia Institute of Marine Science.
• VIMS is not a third party. It is William & Mary's marine research school, based at Gloucester Point across the York River, so the second registrant is an intra-institution relationship rather than the unrelated-registrant pattern that marks leased or brokered address space.
• No IPv6 is announced from this AS.

Notable

• Three observed neighbours against 131,000 addresses is a textbook campus shape: a large, long-held address block reached through a small number of upstreams, most likely including a regional research network. Universities hold far more addresses than their peering count would suggest because their space dates from an era of generous allocations, not because they carry other people's traffic.
• The announcement pattern — each /16 also advertised as its two halving /17s — is ordinary traffic engineering across redundant links, not fragmentation.

Interesting

• Both address blocks are registered to the institutions that use them, so the routing table and the registry agree completely here.

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

Announced prefixes

• 128.239.0.0/16
• 139.70.0.0/16

Upstream networks

• AS174 Cogent Communications, LLC
• AS40220 Virginia Polytechnic Institute and State Univ.
• AS3356 Level 3 Parent, LLC

Adjacent networks

• AS174 Cogent Communications, LLC
• AS40220 Virginia Polytechnic Institute and State Univ.
• AS3356 Level 3 Parent, LLC