asn.dev

Observed topology

AS400304 CRUNCHBITS

Hosting ARIN

Upstreams 11 carry this network
Downstreams 10 this network carries
Adjacent (IPv4) 20
Adjacent (IPv6) 15
Upstream graph Who carries AS400304, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS400304 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 11

Networks observed carrying traffic for AS400304: 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 IPv61,079
AS3257GTT Communications Inc.TransitIPv4 IPv6423
AS6939Hurricane Electric LLCTransitIPv4 IPv6165
AS2914NTT America, Inc.TransitIPv4 IPv6101
AS9002RETN LimitedUnclassifiedIPv4 IPv651
AS852TELUS Communications Inc.ResidentialIPv4 IPv621
AS24482SG.GSHostingIPv4 IPv621
AS394256Tech Futures Interactive Inc.UnclassifiedIPv4 IPv621
AS293ESnetUnclassifiedIPv415
AS3130RGnet OUUnclassifiedIPv415

All 11 upstreams →

Transit

Downstream networks

inferred

Networks for which AS400304 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS40663IncogNet LLCVPNIPv4 IPv6282
AS215659Aokigahara SRLUnclassifiedIPv4 IPv6210
AS216382LAYER MARKETING SERVICES L.L.CUnclassifiedIPv4 IPv6126
AS60841berrybyte LimitedUnclassifiedIPv4119
AS135392MillenialHost LimitedUnclassifiedIPv4118
AS398906Conviction HQUnclassifiedIPv4118
AS200461Ian David KlemmUnclassifiedIPv4 IPv692
AS401619HostBilby Inc.HostingIPv4 IPv691
AS401665HostBilby Inc.HostingIPv4 IPv691
AS200455HOTARU NETWORK LTD.UnclassifiedIPv61

Adjacency

Adjacent networks

All 21

Every AS seen directly next to AS400304 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS1299Arelion Sweden ABTransitIPv4 IPv61,873
AS3257GTT Communications Inc.TransitIPv4 IPv6663
AS40663IncogNet LLCVPNIPv4 IPv6282
AS6939Hurricane Electric LLCTransitIPv4 IPv6262
AS215659Aokigahara SRLUnclassifiedIPv4 IPv6210
AS216382LAYER MARKETING SERVICES L.L.CUnclassifiedIPv4 IPv6126
AS2914NTT America, Inc.TransitIPv4 IPv6121
AS60841berrybyte LimitedUnclassifiedIPv4119
AS135392MillenialHost LimitedUnclassifiedIPv4118
AS398906Conviction HQUnclassifiedIPv4118

All 21 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-31 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.50M 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.