$ 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