University of Wisconsin System

Data as of 2026-10-18
BGP inherited
This organisation
Netblocks19 · 655,619 IPv4 addresses
IPv6 4 prefixes (largest 2600:1d00::/28)
Also registered under this name 20 netblocks across 2 separate records
Record ID250156654
RegistryBGP
Customerssee who runs inside this network →
Evidence & provenance ?
Attribution BGP parent (inherited)
Shared handles clustered on 2 shared RIR contact/maintainer handles
Registry names 2 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

IP Ranges (19)

⬇ export CSV
CIDR Org name Registry Status Confidence
131.210.0.0/16 University of Wisconsin System BGP ANNOUNCED ● high
137.81.0.0/16 University of Wisconsin System BGP ANNOUNCED ● high
137.104.0.0/16 University of Wisconsin System BGP ANNOUNCED ● high
138.49.0.0/16 University of Wisconsin System BGP ANNOUNCED ● high
138.49.160.0/22 University of Wisconsin System BGP ANNOUNCED ● high
139.225.0.0/16 University of Wisconsin System BGP ANNOUNCED ● high
141.233.0.0/16 University of Wisconsin System BGP ANNOUNCED ● high
143.200.0.0/16 University of Wisconsin System BGP ANNOUNCED ● high
143.235.0.0/16 University of Wisconsin System BGP ANNOUNCED ● high
143.236.0.0/16 University of Wisconsin System BGP ANNOUNCED ● high
144.13.0.0/16 University of Wisconsin System BGP ANNOUNCED ● high
144.92.233.237/32 University of Wisconsin System PEERINGDB ASSIGNED ● high
192.35.81.0/24 University of Wisconsin System BGP ANNOUNCED ● high
204.107.122.45/32 University of Wisconsin System PEERINGDB ASSIGNED ● high
206.108.255.66/32 University of Wisconsin System PEERINGDB ASSIGNED ● high
2001:504:27::c38:0:1/128 University of Wisconsin System PEERINGDB ASSIGNED ● high
2600:1d00::/28 University of Wisconsin System BGP ANNOUNCED ● high
2602:f616::45/128 University of Wisconsin System PEERINGDB ASSIGNED ● high
2607:f388:0:2200::3/128 University of Wisconsin System PEERINGDB ASSIGNED ● high

IPv6 ranges (4)

CIDR
2600:1d00::/28
2001:504:27::c38:0:1/128
2602:f616::45/128
2607:f388:0:2200::3/128

Footprint over time

17 weekly snapshots · JSON
19 0 netblocks since 2026-07-05
2026-07-05 peak 19 2026-10-18

Network trust

what's this?
RPKI hygiene: B how networks compare →
89.5% of checked blocks have valid RPKI ROA coverage (17 of 19)
No discrepancies found among checked blocks.

NIC Handles

AS3128 AS3128