AS3128 University of Wisconsin System
AS3128 is operated by University of Wisconsin System and registered with ARIN (US) since 1993-11-17.
It announces 12 IPv4 and 1 IPv6 prefixes, 100% of them RPKI valid.
RIPE RIS sees 6 upstream and peer networks and 6 downstream networks next to it.
PeeringDB lists it as an Educational/Research network at 3 internet exchanges and 4 facilities. Its peering policy is open.
| Name | University of Wisconsin System |
|---|---|
| Registry handle | BRUWS-AS3128 |
| Registry (RIR) | ARIN |
| Country | United States (US) |
| Delegated on | 1993-11-17 |
| Network type | Educational/Research, Regional |
| Peering policy | Open |
| IRR as-set | ARIN::AS-UWSYSNET |
| Prefixes (IPv4 / IPv6) | 12 / 1 |
| RPKI valid | 100% (13 / 13) |
| Upstreams and peers | 6 |
| Downstream networks | 6 |
| Website | wisconsin.edu |
Routing health
- AS3128 announces 12 IPv4 and 1 IPv6 prefixes.
- All 13 announced prefixes are RPKI valid.
- 6 upstreams and peers, 6 downstream networks seen.
For every check with the fix (IRR route objects, the RPKI state of each route, reverse DNS and the registration), run the full network report.
Announced prefixes 13
- 131.210.0.0/16
- 137.81.0.0/16
- 137.104.0.0/16
- 138.49.0.0/16
- 138.49.160.0/22
- 139.225.0.0/16
- 141.233.0.0/16
- 143.200.0.0/16
- 143.235.0.0/16
- 143.236.0.0/16
- 144.13.0.0/16
- 192.35.81.0/24
- 2600:1d00::/28
Upstreams and peers 6
The networks RIPE RIS sees next to AS3128 in BGP paths, the most visible first.
Peering
Peering policy: Open. Suggested max-prefix limits: 60 IPv4, 15 IPv6. PeeringDB record
| Exchange | Ports | Speed | Route server |
|---|---|---|---|
| MadIX | 1 | 10G | No |
| MICE: Shared Peering | 1 | 100G | Yes |
| MKE-IX | 1 | 10G | No |
| Facility | City | Country |
|---|---|---|
| Level(3) Chicago (Kingsbury) | Chicago | US |
| Network 222 | Madison | US |
| Northwestern University co-location facility | Chicago | US |
| University of Wisconsin-Madison | Madison | US |
More about AS3128
Sources: RIR delegation data and PeeringDB (updated daily); routing from RIPEstat (RIPE NCC RIS and RPKI), refreshed daily. Routing data from 2026-11-13 19:32 UTC. The country is where the AS number was registered, not necessarily where the network operates.