asn.dev

Observed topology

AS137 ASGARR Consortium GARR

Unclassified RIPE Educational/Research

Upstreams 13 carry this network
Downstreams 13 this network carries
Adjacent (IPv4) 24
Adjacent (IPv6) 14
Upstream graph Who carries AS137, and who carries them, drawn as a map up to the transit-free core. 3 exchanges Where AS137 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 13

Networks observed carrying traffic for AS137: 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
AS174Cogent Communications, LLCTransitIPv4 IPv62,137
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv61,399
AS6461Zayo BandwidthTransitIPv4 IPv6573
AS20965GEANT VerenigingUnclassifiedIPv4 IPv6495
AS3303Swisscom (Schweiz) AGResidentialIPv4 IPv6161
AS21320GEANT VerenigingUnclassifiedIPv4 IPv687
AS24482SG.GSHostingIPv4 IPv684
AS31543myNet GmbHResidentialIPv4 IPv683
AS59919Brainbox S.r.l.ResidentialIPv482
AS8218Zayo Infrastructure France SAUnclassifiedIPv45

All 13 upstreams →

Transit

Downstream networks

All 13

Networks for which AS137 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS31638Lepida S.c.p.A.UnclassifiedIPv42,870
AS42081European Centre for Medium-Range Weather Forecasts (ECMWF)UnclassifiedIPv4 IPv6417
AS2597Consiglio Nazionale delle RicercheUnclassifiedIPv4 IPv678
AS5502SACLANT Undersea Research CentreUnclassifiedIPv462
AS20745CNIT Italian National Consortium for TelecommunicationsUnclassifiedIPv462
AS42165Directorate General - Joint Research CentreUnclassifiedIPv462
AS200375Istituto Nazionale di Geofisica e VulcanologiaUnclassifiedIPv462
AS16004Milan Internet eXchangeUnclassifiedIPv4 IPv613
AS35110Regione BasilicataUnclassifiedIPv413
AS12New York UniversityUnclassifiedIPv411

All 13 downstreams →

Adjacency

Adjacent networks

All 26

Every AS seen directly next to AS137 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS174Cogent Communications, LLCTransitIPv4 IPv63,679
AS31638Lepida S.c.p.A.UnclassifiedIPv42,870
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv62,405
AS6461Zayo BandwidthTransitIPv4 IPv6979
AS20965GEANT VerenigingUnclassifiedIPv4 IPv6916
AS42081European Centre for Medium-Range Weather Forecasts (ECMWF)UnclassifiedIPv4 IPv6417
AS3303Swisscom (Schweiz) AGResidentialIPv4 IPv6285
AS2597Consiglio Nazionale delle RicercheUnclassifiedIPv4 IPv6179
AS24482SG.GSHostingIPv4 IPv6156
AS21320GEANT VerenigingUnclassifiedIPv4 IPv6150

All 26 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-19 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.17M 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.