AS18091 — TEIKYO-U - Teikyo University

AS18091 announces 1 IPv4 prefixes covering 1,024 addresses and 0 IPv6 prefixes.

About this network

The AS handle TEIKYO-U is held by Teikyo University.

What it's used for

• The address space is registered under the netname THICNET-CIDR-BLK-JP with the Japan Network Information Center, indicating a standard academic allocation.
• The AS announces a single IPv4 prefix of 202.253.108.0/22, totaling 1024 addresses, with no IPv6 prefixes in inventory.
• With only 2 observed neighbours, the low neighbour count relative to the address block suggests a direct connection or limited peering arrangement typical of an isolated institutional network rather than a transit provider.

Notable

• The RDAP registrant is the Japan Network Information Center (JPNIC), which is the standard registry for Japanese IP space and does not indicate a mismatch with the university holder.
• The inventory consists of a single contiguous /22 block, representing a compact and self-contained address estate for the institution.

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

Announced prefixes

• 202.253.108.0/22

Upstream networks

• AS2907 Research Organization of Information and Systems, National Institute of Informatics
• AS2497 Internet Initiative Japan Inc.

Adjacent networks

• AS2907 Research Organization of Information and Systems, National Institute of Informatics
• AS2497 Internet Initiative Japan Inc.

Routing security

• RPKI: 0 valid, 0 invalid and 3 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 4 route objects.
• Listed in as-sets: AS-IIJ, AS-IIJ6, AS20965:AS-FROM-TEIN-TO-GEANT, AS2497:AS-IIJ, AS2497:AS-IIJ6.