asn.dev

Observed topology

AS199803 ComSource ComSource s.r.o.

Hosting RIPE

Upstreams 6 carry this network
Downstreams 10 this network carries
Adjacent (IPv4) 18
Adjacent (IPv6) 8
Upstream graph Who carries AS199803, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS199803 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS199803: 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.

ASNetworkTypeFamiliesPaths seen
AS1299Arelion Sweden ABTransitIPv4 IPv652
AS3356Level 3 Parent, LLCTransitIPv4 IPv648
AS6939Hurricane Electric LLCTransitIPv4 IPv643
AS24482SG.GSHostingIPv4 IPv63
AS29504Freenet Liberec, z.s.UnclassifiedIPv4 IPv63
AS8218Zayo Infrastructure France SAUnclassifiedIPv42

Transit

Downstream networks

inferred

Networks for which AS199803 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS35592Coolhousing s.r.o.HostingIPv4 IPv6307
AS205233KBC GLOBAL SERVICES NVUnclassifiedIPv4301
AS51013WebSupport s.r.o.HostingIPv4252
AS39790Web4U s.r.o.HostingIPv4 IPv6249
AS29405VNET a.s.HostingIPv4232
AS25234ACTIVE 24, s.r.o.HostingIPv4146
AS35236UVT Internet s.r.o.UnclassifiedIPv4118
AS206591Alza.cz a.s.UnclassifiedIPv458
AS206142Internet TV, Inc.UnclassifiedIPv457
AS8778Slovanet a.s.ResidentialIPv41

Adjacency

Adjacent networks

All 18

Every AS seen directly next to AS199803 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS1299Arelion Sweden ABTransitIPv4 IPv6916
AS3356Level 3 Parent, LLCTransitIPv4 IPv6741
AS35592Coolhousing s.r.o.HostingIPv4 IPv6548
AS6939Hurricane Electric LLCTransitIPv4 IPv6458
AS205233KBC GLOBAL SERVICES NVUnclassifiedIPv4301
AS51013WebSupport s.r.o.HostingIPv4252
AS39790Web4U s.r.o.HostingIPv4 IPv6249
AS29405VNET a.s.HostingIPv4232
AS35236UVT Internet s.r.o.UnclassifiedIPv4180
AS25234ACTIVE 24, s.r.o.HostingIPv4 IPv6178

All 18 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-13 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 74.40M 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.