asn.dev

Observed topology

AS21215 UGNI

Residential RIPE NSP

Upstreams 39 carry this network
Downstreams 8 this network carries
Adjacent (IPv4) 47
Adjacent (IPv6) 28
Upstream graph Who carries AS21215, and who carries them, drawn as a map up to the transit-free core. 14 exchanges Where AS21215 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 39

Networks observed carrying traffic for AS21215: 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 IPv6112
AS1299Arelion Sweden ABTransitIPv4 IPv6105
AS6939Hurricane Electric LLCTransitIPv4 IPv667
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv632
AS174Cogent Communications, LLCTransitIPv4 IPv629
AS50304Blix Solutions ASUnclassifiedIPv420
AS1836green.ch AGResidentialIPv4 IPv611
AS17639Converge ICT Solutions Inc.UnclassifiedIPv4 IPv611
AS24482SG.GSHostingIPv4 IPv611
AS29504Freenet Liberec, z.s.UnclassifiedIPv4 IPv611

All 39 upstreams →

Transit

Downstream networks

inferred

Networks for which AS21215 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS8866Vivacom Bulgaria EADResidentialIPv4 IPv63,875
AS25472Nova Telecommunications & Media Single Member S.AResidentialIPv4 IPv63,040
AS1241Nova Telecommunications & Media Single Member S.AResidentialIPv4 IPv61,864
AS42560Telemach BH d.o.o. SarajevoUnclassifiedIPv4985
AS51859Mainstream doo BeogradUnclassifiedIPv4898
AS3212Telemach Slovenija d.o.o.ResidentialIPv4 IPv6328
AS31042Yettel d.o.o.ResidentialIPv4 IPv655
AS205714Telemach Hrvatska d.o.o.UnclassifiedIPv423

Adjacency

Adjacent networks

All 52

Every AS seen directly next to AS21215 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS8866Vivacom Bulgaria EADResidentialIPv4 IPv65,491
AS174Cogent Communications, LLCTransitIPv4 IPv64,931
AS25472Nova Telecommunications & Media Single Member S.AResidentialIPv4 IPv64,622
AS3356Level 3 Parent, LLCTransitIPv4 IPv63,045
AS1299Arelion Sweden ABTransitIPv4 IPv62,853
AS1241Nova Telecommunications & Media Single Member S.AResidentialIPv4 IPv62,819
AS42560Telemach BH d.o.o. SarajevoUnclassifiedIPv42,362
AS50628Leonix Telecom SASUnclassifiedIPv4 IPv62,032
AS51859Mainstream doo BeogradUnclassifiedIPv4898
AS3212Telemach Slovenija d.o.o.ResidentialIPv4 IPv6793

All 52 adjacent →

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.