Autonomous system
AS4665 YONSEI-AS-KR Yonsei University
Education APNIC
Summary
Yonsei University
education university research legacy
YONSEI-AS-KR is the campus network of Yonsei University in Seoul, one of South Korea's oldest and most prominent private research universities.
What it's used for
- Campus, research, and administrative networking across Yonsei's Sinchon and other campuses: labs, faculty and student services, libraries, and university-run systems.
- Roughly a /16 worth of IPv4 address space, a size typical of universities that were allocated addresses before conservation rules tightened.
Notable
- Yonsei is one of the "SKY" universities, the informal trio (with Seoul National and Korea University) at the top of Korean higher education, and its network is correspondingly large.
- Korean universities and research institutes were central to the country's early internet — Korea built one of the first TCP/IP networks outside the United States — which is why several of them hold low four-digit AS numbers.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-27, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 26 prefixes · 65.28K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| KR | Korea, Republic of | 26 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS4665- Registry name
- YONSEI-AS-KR-KR
- Abuse contact
- hostmaster@nic.or.kr
- Registered
- 2004-12-17
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 33 with no ROA
- ROAs
- 0 authorising AS4665
- ASPA
- no ASPA record
- IRR
- 91% registered · 30 of 33 announcements 1 other origin
- Route objects
- 35 naming AS4665
Reputation
Classification and threat
Education University, school or national research and education network.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 446 networks and 1,852 prefixes, as published 2026-10-27. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere