Autonomous system
AS3128 BRUWS-AS3128
Education APNIC Educational/Research
Summary
University of Wisconsin System
education research legacy
BRUWS-AS3128 is held by the University of Wisconsin System, the state's public university system spanning UW-Madison, UW-Milwaukee, and the regional universities across Wisconsin.
What it's used for
- Campus and research networking for the UW System's institutions: academic and administrative systems, residence halls, labs, libraries, and public-facing university services.
Notable
- The announced space is unusually large for a single institution, running to several legacy
/16s and over half a million IPv4 addresses. That scale is a signature of early university allocations, when a campus could ask for a Class B and get one. - Institutional address space: IPs here map to university buildings and systems, not to residential subscribers or hosting customers. ARIN registered the ASN in 1993.
Interesting
- Wisconsin's state government runs its own separate network on AS3136, registered just two days later in the same 1993 batch.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 2 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Midwest Internet Cooperative Exchange | Minneapolis, United States | 206.108.255.66 |
| Milwaukee Internet Exchange | Milwaukee, United States | 204.107.122.45 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 17 prefixes · 656K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 18 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS3128- Registry name
- BRUWS-AS3128
- Registrant
- University of Wisconsin System
- Abuse contact
- noc@uwsys.net
- Registered
- 1993-11-17
- Last changed
- 2018-03-07
- Allocation
- assigned
Declared
PeeringDB profile
- Name
- University of Wisconsin System
- Network type
- Educational/Research
- Scope
- Regional
- Traffic ratio
- Mostly Inbound
- Peering policy
- Open
- IRR as-set
AS-UWSYSNET- Present at
- 3 exchanges
- Facilities
- 4 facilities
- Website
- https://www.wisconsin.edu
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 100% valid · 13 valid, 0 with no ROA
- ROAs
- 22 authorising AS3128
- ASPA
- no ASPA record
- IRR
- 100% registered · 13 of 13 announcements
- Route objects
- 26 naming AS3128
Reputation
Classification and threat
Education University, school or national research and education network.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 431 networks and 1,768 prefixes, as published 2026-10-12. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere