Observed topology

AS45400 NICNET Korea Telecom

Unclassified ARIN

Upstreams 1 carry this network

Downstreams 8 this network carries

Adjacent (IPv4) 9

Adjacent (IPv6) 0

Upstream graph Who carries AS45400, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS45400 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS45400: the AS immediately before it in a routing path. Ranked by how many paths showed the relationship, which reflects how widely it is used, not how much traffic crosses it.

AS	Network	Type	Families	Paths seen
AS17841	NATIONAL INFORMATION RESOURCES SERVICE	Unclassified	IPv4	6,588

Transit

Downstream networks

inferred

Networks for which AS45400 was observed as the last hop before the origin, meaning it appears to provide them transit.

AS	Network	Type	Families	Paths seen
AS17574	Seoul Metropolitan Government Computer Center	Unclassified	IPv4	204
AS10165	KOREA CUSTOMS SERVICE	Unclassified	IPv4	176
AS23585	Ministry of Justice	Unclassified	IPv4	126
AS10043	Ministry of Science and ICT	Unclassified	IPv4	62
AS38102	SCOURTFAMILY	Unclassified	IPv4	62
AS10161	QIA	Unclassified	IPv4	28
AS23592	Ministry of Food and Drug Safety	Unclassified	IPv4	6
AS38682	National Institute of Environmental Research	Unclassified	IPv4	1

Adjacency

Adjacent networks

observed

Every AS seen directly next to AS45400 in a routing path, in either direction.

AS	Network	Type	Families	Paths seen
AS17841	NATIONAL INFORMATION RESOURCES SERVICE	Unclassified	IPv4	7,253
AS17574	Seoul Metropolitan Government Computer Center	Unclassified	IPv4	204
AS10165	KOREA CUSTOMS SERVICE	Unclassified	IPv4	176
AS23585	Ministry of Justice	Unclassified	IPv4	126
AS10043	Ministry of Science and ICT	Unclassified	IPv4	62
AS38102	SCOURTFAMILY	Unclassified	IPv4	62
AS10161	QIA	Unclassified	IPv4	28
AS23592	Ministry of Food and Drug Safety	Unclassified	IPv4	6
AS38682	National Institute of Environmental Research	Unclassified	IPv4	1

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-21 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.14M route entries. These are observations from those vantage points, not a complete or authoritative view of the internet.

Inferred from path position, not from any declaration by either party. A network appearing here is carrying these routes; whether that is a paid transit arrangement, a backup, or something else is not something routing data can tell you. Adjacency is not the same as peering. Being next to each other in a path covers paid transit, settlement-free peering and customer connections alike, and routing data cannot distinguish them. Treat this as "these networks exchange routes", nothing more specific.

Cross-check against RIPEstat or BGP.tools, which observe from a different and larger set of vantage points.