asn.dev

Observed topology

AS199803 ComSource ComSource s.r.o.

Hosting RIPE

Upstreams 6 carry this network
Downstreams 9 this network carries
Adjacent (IPv4) 16
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 IPv646
AS24482SG.GSHostingIPv4 IPv63
AS29504Freenet Liberec, z.s.UnclassifiedIPv4 IPv63
AS1764Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbHUnclassifiedIPv42

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
AS205233KBC GLOBAL SERVICES NVUnclassifiedIPv4315
AS35592Coolhousing s.r.o.HostingIPv4 IPv6307
AS51013WebSupport s.r.o.HostingIPv4252
AS39790Web4U s.r.o.HostingIPv4 IPv6251
AS29405VNET a.s.HostingIPv4236
AS25234ACTIVE 24, s.r.o.HostingIPv4146
AS35236UVT Internet s.r.o.UnclassifiedIPv4120
AS206591Alza.cz a.s.UnclassifiedIPv459
AS206142Internet TV, Inc.UnclassifiedIPv457

Adjacency

Adjacent networks

All 16

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

ASNetworkTypeFamiliesPaths seen
AS1299Arelion Sweden ABTransitIPv4 IPv6928
AS3356Level 3 Parent, LLCTransitIPv4 IPv6734
AS35592Coolhousing s.r.o.HostingIPv4 IPv6550
AS6939Hurricane Electric LLCTransitIPv4 IPv6483
AS205233KBC GLOBAL SERVICES NVUnclassifiedIPv4315
AS51013WebSupport s.r.o.HostingIPv4252
AS39790Web4U s.r.o.HostingIPv4 IPv6251
AS29405VNET a.s.HostingIPv4236
AS35236UVT Internet s.r.o.UnclassifiedIPv4181
AS25234ACTIVE 24, s.r.o.HostingIPv4 IPv6178

All 16 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-02 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.44M 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.