asn.dev

Observed topology

AS51331 MODERNTV

Hosting RIPE Content

Upstreams 10 carry this network
Downstreams 1 this network carries
Adjacent (IPv4) 10
Adjacent (IPv6) 5
Upstream graph Who carries AS51331, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS51331 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS51331: 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
AS25512CD-Telematika a.s.UnclassifiedIPv4 IPv6170
AS42000Futruy s.r.o.UnclassifiedIPv687
AS6939Hurricane Electric LLCTransitIPv466
AS25248RADIOKOMUNIKACE a.s.UnclassifiedIPv4 IPv662
AS8778Slovanet a.s.ResidentialIPv459
AS8251FreeTel, s.r.o.HostingIPv447
AS24482SG.GSHostingIPv4 IPv69
AS29504Freenet Liberec, z.s.UnclassifiedIPv4 IPv69
AS20562Broadband Hosting B.V.HostingIPv46
AS37721Virtual Technologies & SolutionsResidentialIPv46

Transit

Downstream networks

inferred

Networks for which AS51331 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS198813SychrovNET s.r.oUnclassifiedIPv421

Adjacency

Adjacent networks

All 11

Every AS seen directly next to AS51331 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS25512CD-Telematika a.s.UnclassifiedIPv4 IPv6170
AS42000Futruy s.r.o.UnclassifiedIPv687
AS25248RADIOKOMUNIKACE a.s.UnclassifiedIPv4 IPv686
AS6939Hurricane Electric LLCTransitIPv466
AS8778Slovanet a.s.ResidentialIPv459
AS8251FreeTel, s.r.o.HostingIPv447
AS198813SychrovNET s.r.oUnclassifiedIPv428
AS37721Virtual Technologies & SolutionsResidentialIPv410
AS24482SG.GSHostingIPv4 IPv69
AS29504Freenet Liberec, z.s.UnclassifiedIPv4 IPv69

All 11 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-14 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.25M 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.