asn.dev

Observed topology

AS21247 IPSYN-AS

Unclassified RIPE

Upstreams 10 carry this network
Downstreams 0 this network carries
Adjacent (IPv4) 7
Adjacent (IPv6) 8
Upstream graph Who carries AS21247, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS21247 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS21247: 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
AS29075IELO-LIAZO SERVICES SASUnclassifiedIPv435
AS6939Hurricane Electric LLCTransitIPv4 IPv622
AS8218Zayo Infrastructure France SAUnclassifiedIPv415
AS39801France IX Services SASUUnclassifiedIPv4 IPv611
AS9002RETN LimitedUnclassifiedIPv64
AS24482SG.GSHostingIPv4 IPv62
AS37721Virtual Technologies & SolutionsResidentialIPv4 IPv62
AS50628Leonix Telecom SASUnclassifiedIPv4 IPv62
AS25091IP-Max SAUnclassifiedIPv61
AS34019Hivane AssociationUnclassifiedIPv61

Transit

Downstream networks

inferred

Networks for which AS21247 was observed as the last hop before the origin, meaning it appears to provide them transit.

No downstream observed. This network does not appear to carry transit for anyone.

Adjacency

Adjacent networks

observed

Every AS seen directly next to AS21247 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS29075IELO-LIAZO SERVICES SASUnclassifiedIPv435
AS6939Hurricane Electric LLCTransitIPv4 IPv622
AS8218Zayo Infrastructure France SAUnclassifiedIPv415
AS39801France IX Services SASUUnclassifiedIPv4 IPv611
AS9002RETN LimitedUnclassifiedIPv64
AS24482SG.GSHostingIPv4 IPv62
AS37721Virtual Technologies & SolutionsResidentialIPv4 IPv62
AS50628Leonix Telecom SASUnclassifiedIPv4 IPv62
AS25091IP-Max SAUnclassifiedIPv61
AS34019Hivane AssociationUnclassifiedIPv61

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-28 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.21M 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.