asn.dev

Observed topology

AS21430 WIA-AS WIA spol. s.r.o.

Unclassified RIPE

Upstreams 11 carry this network
Downstreams 9 this network carries
Adjacent (IPv4) 20
Adjacent (IPv6) 13
Upstream graph Who carries AS21430, and who carries them, drawn as a map up to the transit-free core. 2 exchanges Where AS21430 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 11

Networks observed carrying traffic for AS21430: 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 ABTransitIPv41,505
AS3491PCCW Global (HK) Ltd.TransitIPv4 IPv6766
AS6939Hurricane Electric LLCTransitIPv4 IPv6720
AS39392SH.cz s.r.o.HostingIPv4 IPv6399
AS3257GTT Communications Inc.TransitIPv4 IPv6387
AS24482SG.GSHostingIPv4 IPv670
AS29504Freenet Liberec, z.s.UnclassifiedIPv4 IPv670
AS37721Virtual Technologies & SolutionsResidentialIPv4 IPv666
AS8218Zayo Infrastructure France SAUnclassifiedIPv4 IPv611
AS1764Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbHUnclassifiedIPv4 IPv610

All 11 upstreams →

Transit

Downstream networks

inferred

Networks for which AS21430 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS203376Mailkit s.r.o.UnclassifiedIPv4 IPv6147
AS33943Quadruple a.s.UnclassifiedIPv4 IPv691
AS15614Dragon Internet a.s.ResidentialIPv482
AS204183Omnivery s.r.o.UnclassifiedIPv460
AS209369The Cloud Provider s.r.o.HostingIPv446
AS48451Prazska energetika, a.s.UnclassifiedIPv4 IPv637
AS42189Druzstvo EUROSIGNALUnclassifiedIPv435
AS12608IGLG Network CZ s.r.o.HostingIPv4 IPv629
AS39761ABAK, Co.Ltd.UnclassifiedIPv420

Adjacency

Adjacent networks

All 20

Every AS seen directly next to AS21430 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS1299Arelion Sweden ABTransitIPv41,634
AS3491PCCW Global (HK) Ltd.TransitIPv4 IPv6979
AS6939Hurricane Electric LLCTransitIPv4 IPv6775
AS3257GTT Communications Inc.TransitIPv4 IPv6518
AS39392SH.cz s.r.o.HostingIPv4 IPv6465
AS203376Mailkit s.r.o.UnclassifiedIPv4 IPv6147
AS15614Dragon Internet a.s.ResidentialIPv4127
AS33943Quadruple a.s.UnclassifiedIPv4 IPv691
AS29504Freenet Liberec, z.s.UnclassifiedIPv4 IPv681
AS24482SG.GSHostingIPv4 IPv679

All 20 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.