AS15119 — SOUTHERN-ILLINOIS-UNIVERSITY

AS15119 announces 4 IPv4 prefixes covering 61,440 addresses and 0 IPv6 prefixes.

About this network

Four announcements that tile one range, with the pieces the medical school routes left out.

What it's used for

• A university network. Four IPv4 prefixes announced from the United States, no IPv6, and three observed BGP neighbours.

Notable

• All four prefixes come out of 131.230, at four different lengths, covering the range in successively smaller pieces.
• The pieces missing from that sequence are the ones announced by the neighbouring AS number belonging to this university's own school of medicine.
• Every resolved block carries the netname SIU-NET and is registered to the university itself.
• One of twelve sampled addresses answered, as mclaf-9e-7448-b.infra.siu.edu, a building abbreviation followed by three short codes under a subdomain for infrastructure.
• One registry lookup failed, so that block's ownership is unknown rather than absent.

Interesting

• Reading this record alongside the medical school's shows what a registry cannot: one allocation, one netname, one registrant, and two separate networks with different transit underneath. Anyone attributing traffic by registered holder gets the university for both; anyone attributing by AS number gets two institutions.
• The reverse name encodes a building and a piece of equipment inside it. That is more physical detail than most holders publish, and it is exactly the sort of naming that maps a campus for anyone who collects it.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 131.230.0.0/17
• 131.230.128.0/18
• 131.230.192.0/19
• 131.230.240.0/20

Upstream networks

• AS174 Cogent Communications, LLC
• AS40702 Clearwave Communications

Adjacent networks

• AS174 Cogent Communications, LLC
• AS40702 Clearwave Communications