AS9769 SEJONG-AS Sejong University

AS9769 (SEJONG-AS) is held by Sejong University, a private university in Gwangjin-gu, Seoul. This is the campus network: it carries the university's own students, staff, labs and public-facing services, and nothing else.

What it's used for

RIS shows 28,160 IPv4 addresses across 15 prefixes. The footprint is anchored on a 223.195.0.0/18 with a /20 beside it, plus a pair of /21s and several /22s and /23s in 210.107.x, and a small 203.250.148.0/23 group. Nearly 30,000 addresses is a large but entirely ordinary holding for a Korean university, which reflects when the space was assigned rather than any present-day need: campuses in this ASN range were allocated generously in the 1990s, long before NAT and RFC 1918 addressing became the norm for lab and dormitory subnets.

The decisive signal is that all of it hangs off one observed BGP neighbour. A single upstream on 28k addresses rules out any transit or wholesale role — thousands of neighbours would be the tell for that. In Korea the research-and-education backbone (KREONET/KOREN) is the usual single upstream for a campus AS, and a university's ASN typically exists so it can hold portable space and announce it consistently rather than to multi-home. No IPv6 is announced from this ASN.

Notable

• Sejong is a private institution, not to be confused with Sejong City or the state bodies that carry the same name. The handle is not evidence of a government network.
• The more-specific prefixes inside the /18 suggest internal routing policy or historical sub-allocations to departments, not separate organisations.