Autonomous system
AS45393 SFS-AS-KR-KR - SFS
Unclassified APNIC
Summary
Seoul Foreign School
education business korea school
The AS handle SFS-AS-KR is held by Seoul Foreign School.
What it's used for
- The address space carries internal corporate and educational infrastructure, evidenced by netnames such as
SK-TELECOM-NET-KR,KORNET-KR, andbroadNnet-KRassigned to the school's blocks. - The network announces 2048 IPv4 addresses across 4 prefixes and maintains 2 observed neighbours, a ratio consistent with a small, self-contained site network rather than a transit or large-scale access provider.
- Traffic from this AS consists of office workers, students, and staff accessing the internet from the school's premises in Seoul.
Notable
- The registrants for all announced prefixes are
IRT-KRNIC-KR, which aligns with the Korean National Internet Center registry, while the netnames reflect the upstream providers (SK Telecom and KORNET) rather than the school's own branding. - The address inventory is small and fragmented, consisting of one /22, one /23, and two /24 blocks, typical of an organization leasing or holding specific ranges for its internal use.
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 2026-11-01, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 4 prefixes · 2.05K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| KR | Korea, Republic of | 4 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS45393- Registry name
- SFS-AS-KR-KR
- Abuse contact
- hostmaster@nic.or.kr
- Registered
- 2008-08-19
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 8 with no ROA
- ROAs
- 0 authorising AS45393
- ASPA
- no ASPA record
- IRR
- 100% registered · 8 of 8 announcements
- Route objects
- 11 naming AS45393
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
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: 449 networks and 1,846 prefixes, as published 2026-11-02. 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