Autonomous system detail

AS59

Announced

Operated by WISC-MADISON-AS - University of Wisconsin Madison.

Summary

// analyst note
Live, low-risk academic ASN; encountered as UW-Madison campus routing.
// security note
NEUTRAL/DATED: no notable public abuse signal found as of 2026-06-08.
IPv4 prefixes
15
~331.0K addresses
IPv6 prefixes
1
announced
Peer networks
3
3 up · 0 down
IANA block
1-1876
Assigned by ARIN
[ 01 ] — Context

About this ASN.

Updated  ·  Confidence: High

AS59 is a legacy allocation registered under ARIN to the University of Wisconsin–Madison (org UWM-3), and it remains the university's campus autonomous system — one of the oldest continuously university-held ASNs. The RADB as-name is "UW-Madison," maintained under MAINT-AS3128. It originates UW-Madison address space (for example 205.213.248.0/22) and connects via the University of Wisconsin System network (AS3128) and WiscNet. The ARIN ASN RegDate is 1986-01-21 (updated 2012-03-02; the UWM-3 org record RegDate of 2004-10-05 is a later refresh). It is actively announcing as a small university network, peering with about two networks and one upstream. Exact prefix counts, AS rank, customer cone, and RPKI status were not fully captured this cycle and are recorded as unknown/partial rather than guessed. For triage this is a live, low-risk academic ASN, encountered as UW-Madison campus routing. No notable public abuse signal was found as of June 2026.

Operator
University of Wisconsin–Madison (ARIN OrgId UWM-3, Madison, WI 53706) [Confirmed] — ARIN RDAP
Country / RIR
US, ARIN [Confirmed]
Allocated
ARIN ASN RegDate 1986-01-21 (updated 2012-03-02; org RegDate 2004-10-05 is a later refresh) [Confirmed]
Org status
active — wisc.edu

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-08 — bgp.he.net

Network & routing

Network type
research / education [Confirmed]
Size
small university network; originates UW-Madison space (e.g., 205.213.248.0/22); exact counts not fully captured — bgp.tools (2026-06)
Routing/peering
active; peers ~2 networks, 1 upstream; connects via AS3128 (UW System) and WiscNet; RPKI unknown/partial — bgp.tools, bgp.he.net
Notable usage
UW–Madison campus autonomous system (RADB as-name "UW-Madison"); one of the oldest continuously university-held ASNs — wisc.edu
Related ASNs
AS3128 (University of Wisconsin System), AS2381 (WiscNet); member of AS-WISCNET-WRIPS peering set [Confirmed]
Analyst note
Live, low-risk academic ASN; encountered as UW-Madison campus routing.
[ 02 ] — Announced prefixes

What this network routes.

16 prefixes total · RIPEstat data · cached, not real-time
// IPv4 prefixes15
  1. 128.104.0.0/16/16
  2. 146.151.0.0/16/16
  3. 144.92.0.0/16/16
  4. 128.105.0.0/16/16
  5. 72.33.0.0/16/16
  6. 205.213.248.0/22/22
  7. 198.51.254.0/24/24
  8. 192.12.220.0/24/24
  9. 198.51.246.0/24/24
  10. 192.12.223.0/24/24
  11. 192.12.224.0/24/24
  12. 198.133.225.0/24/24
  13. 192.86.79.0/24/24
  14. 198.133.224.0/24/24
  15. 198.51.247.0/24/24
// IPv6 prefixes1
  1. 2607:f388::/32/32
[ 03 ] — Notable peers & upstreams

Who it talks to.

3 observed neighbours
// Notable connectionsTop 3 of 3
ASNOperatorRole
AS3128 — upstream
AS11537 — upstream
AS293 — upstream
Neighbours observed via public BGP collectors; not a complete peering list.