AS9367 ISCT Institute of Science Tokyo

AS9367 (ISCT) is held by the Institute of Science Tokyo (東京科学大学, "Science Tokyo") — the national university formed by the merger of the Tokyo Institute of Technology and Tokyo Medical and Dental University. The ASN and its address space carry the campus network of what was Tokyo Tech, and the registry name was updated to reflect the merged institution.

What it's used for

This is a university campus network, and the routing shows it plainly. RIS sees 2 IPv4 prefixes covering 65,536 addresses — a legacy 131.112.0.0/16 plus a single 131.112.254.0/24 more-specific — one IPv6 prefix (2403:4440::/32), and only 2 observed BGP neighbours. A whole /16 of address space with two upstreams is the signature of a large institution consuming connectivity rather than selling it: no peering fabric, no downstream customers, just campus users, research groups, lab equipment and public-facing university services behind a couple of research-network uplinks. In Japan that upstream is normally SINET, the national academic backbone, which is how the university's traffic reaches both the commercial internet and other research institutions.

Notable

• 131.112.0.0/16 is classic early-internet academic allocation: a /16 handed to a national engineering university long before address scarcity mattered.
• The /24 more-specific alongside the covering /16 is a routing-policy artefact — typically a segment steered to a different path or protected against a specific failure mode — not a separate organisation.
• The ASN's dual v4 and v6 announcement is the norm for Japanese national universities, which have run production IPv6 for a long time via the academic backbone.