$ query “AS3128” --type=asn → 1 result(s)
AS3128 · BRUWS-AS3128
University of Wisconsin System
AS3128 is operated by University of Wisconsin System and serves as an educational/research access provider, registered in the United States since 1993. The system announces a solid 655 616 IPv4 addresses, including a /16, and supports IPv6. Most of its address space is geolocated to the United States.
- Pioneer — Registered before the year 2000
Basic Information
- Country
- 🇺🇸 United States
- Category
- Education/Research
- Network Role
- Access Provider
- Data Origin
- Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
- Registered
- November 17, 1993
- Last Changed
- March 04, 2026
- Last Seen
- April 30, 2026 (active)
Prefix Summary
- IPv4 Prefixes (raw / aggregated)
- 12 / 11
- IPv6 Prefixes (raw / aggregated)
- 1 / 1
- IPv4 Addresses
- 655 616
- Largest IPv4 Prefix
- /16 (65 536 addresses)
- Largest IPv6 Prefix
- /28
- Geolocated Countries
- 🇺🇸 United States (1 179 904 IPs)
- Prefix Changed
- April 04, 2026
Reputation
- Reputation
- Pristine — 0 flagged IPs
Connectivity Summary
- Upstream Providers
- 6 upstreams providing transit
- Peers
- 2 networks exchanging traffic without transit
- Downstream Customers
- 6 downstreams buying transit
- Unclassified
- 1 unclassified BGP neighbor
- Degree
- 15 unique BGP neighbors
- Reach
- 6 networks in customer cone
Upstream Providers (6)
Prefix Lists
IPv4 Prefixes (12 total)
- 131.210.0.0/16 (65 536 addresses (/16 prefix))
- 137.81.0.0/16 (65 536 addresses (/16 prefix))
- 137.104.0.0/16 (65 536 addresses (/16 prefix))
- 138.49.0.0/16 (65 536 addresses (/16 prefix))
- 139.225.0.0/16 (65 536 addresses (/16 prefix))
- 141.233.0.0/16 (65 536 addresses (/16 prefix))
- 143.200.0.0/16 (65 536 addresses (/16 prefix))
- 143.235.0.0/16 (65 536 addresses (/16 prefix))
- 143.236.0.0/16 (65 536 addresses (/16 prefix))
- 144.13.0.0/16 (65 536 addresses (/16 prefix))
- 192.35.81.0/24 (256 addresses (/24 prefix))
IPv6 Prefixes (1 total)
- 2600:1d00::/28