asn.dev

Observed topology

AS57821 NONATTACHED-AS

Unclassified RIPE

Upstreams 6 carry this network
Downstreams 89 this network carries
Adjacent (IPv4) 72
Adjacent (IPv6) 70
Upstream graph Who carries AS57821, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS57821 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS57821: 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
AS12586GHOSTnet GmbHHostingIPv446
AS6939Hurricane Electric LLCTransitIPv4 IPv643
AS24482SG.GSHostingIPv4 IPv62
AS25091IP-Max SAUnclassifiedIPv61
AS202365Omer GOLGELIUnclassifiedIPv41
AS212508Lowhosting services of Davide GennariUnclassifiedIPv41

Transit

Downstream networks

All 89

Networks for which AS57821 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS12586GHOSTnet GmbHHostingIPv4 IPv6483
AS6939Hurricane Electric LLCTransitIPv4 IPv6274
AS24482SG.GSHostingIPv4 IPv649
AS13101TNG Stadtnetz GmbHResidentialIPv4 IPv637
AS13335Cloudflare, Inc.HostingIPv437
AS59790Marco Bungalski GmbHResidentialIPv4 IPv635
AS25394MK Netzdienste Verwaltungs GmbH trading as MK Netzdienste GmbH & Co. KGResidentialIPv4 IPv632
AS25091IP-Max SAUnclassifiedIPv4 IPv626
AS57433intercolo GmbHUnclassifiedIPv4 IPv623
AS35366ISPpro Internet KGHostingIPv418

All 89 downstreams →

Adjacency

Adjacent networks

All 98

Every AS seen directly next to AS57821 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS12586GHOSTnet GmbHHostingIPv4 IPv6884,814
AS6939Hurricane Electric LLCTransitIPv4 IPv6379,433
AS57463NetIX Communications JSCUnclassifiedIPv4 IPv650,259
AS24482SG.GSHostingIPv4 IPv63,403
AS25091IP-Max SAUnclassifiedIPv4 IPv6537
AS25394MK Netzdienste Verwaltungs GmbH trading as MK Netzdienste GmbH & Co. KGResidentialIPv4 IPv6120
AS13101TNG Stadtnetz GmbHResidentialIPv4 IPv6108
AS29551Aixit GmbHHostingIPv462
AS52025ParadoxNetworks LimitedUnclassifiedIPv459
AS59790Marco Bungalski GmbHResidentialIPv4 IPv639

All 98 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-22 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.12M 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.