asn.dev

Observed topology

AS5603 SIOL-NET Telekom Slovenije d.d.

Mobile RIPE

Upstreams 24 carry this network
Downstreams 126 this network carries
Adjacent (IPv4) 150
Adjacent (IPv6) 36
Upstream graph Who carries AS5603, and who carries them, drawn as a map up to the transit-free core. 3 exchanges Where AS5603 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 24

Networks observed carrying traffic for AS5603: 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
AS3356Level 3 Parent, LLCTransitIPv4 IPv62,130
AS6939Hurricane Electric LLCTransitIPv4 IPv6644
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4388
AS3320Deutsche Telekom AGMobileIPv4 IPv6380
AS5405Inter.link GmbHUnclassifiedIPv4 IPv6332
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv6250
AS48362Stadtwerke FeldkirchResidentialIPv4 IPv695
AS3303Swisscom (Schweiz) AGResidentialIPv4 IPv692
AS33891Core-Backbone GmbHHostingIPv487
AS24482SG.GSHostingIPv4 IPv686

All 24 upstreams →

Transit

Downstream networks

All 126

Networks for which AS5603 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS21107Blicnet d.o.o. Banja LukaUnclassifiedIPv4 IPv61,641
AS21246IPKO Telecommunications LLCUnclassifiedIPv4 IPv6649
AS198279Albanian Telecommunications Union SH. P.K.UnclassifiedIPv4 IPv6390
AS6764PERFTECH, podjetje za proizvodnjo in uvajanje novih tehnologij, d.o.o.HostingIPv4246
AS197663POLANS, telekomunikacijske storitve d.o.o.UnclassifiedIPv4245
AS44632KRONTRON d.o.o.UnclassifiedIPv4164
AS200899INTERSPACE DOOEL SkopjeUnclassifiedIPv4 IPv6159
AS28933University of Ljubljana, Faculty of Electrical EngineeringUnclassifiedIPv4 IPv6156
AS212548Petrol d.d. LjubljanaUnclassifiedIPv4 IPv6126
AS57554Zavarovalnica Sava, d.d.UnclassifiedIPv4122

All 126 downstreams →

Adjacency

Adjacent networks

All 154

Every AS seen directly next to AS5603 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS3356Level 3 Parent, LLCTransitIPv4 IPv65,816
AS5405Inter.link GmbHUnclassifiedIPv4 IPv63,993
AS21107Blicnet d.o.o. Banja LukaUnclassifiedIPv4 IPv61,641
AS34772NEOTEL AD SkopjeUnclassifiedIPv4 IPv61,633
AS6939Hurricane Electric LLCTransitIPv4 IPv61,529
AS9002RETN LimitedUnclassifiedIPv4 IPv61,431
AS21246IPKO Telecommunications LLCUnclassifiedIPv4 IPv61,221
AS3320Deutsche Telekom AGMobileIPv4 IPv61,193
AS198279Albanian Telecommunications Union SH. P.K.UnclassifiedIPv4 IPv6989
AS34547TELESMART TELEKOM DOOUnclassifiedIPv4 IPv6748

All 154 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-17 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.18M 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.