asn.dev

Observed topology

AS12577 MMC-AT-AS MMC GmbH

Unclassified RIPE Cable/DSL/ISP

Upstreams 8 carry this network
Downstreams 5 this network carries
Adjacent (IPv4) 15
Adjacent (IPv6) 6
Upstream graph Who carries AS12577, and who carries them, drawn as a map up to the transit-free core. 2 exchanges Where AS12577 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS12577: 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
AS33891Core-Backbone GmbHHostingIPv4 IPv662
AS174Cogent Communications, LLCTransitIPv4 IPv648
AS6939Hurricane Electric LLCTransitIPv4 IPv634
AS34549meerfarbig GmbH & Co. KGHostingIPv43
AS48362Stadtwerke FeldkirchResidentialIPv4 IPv63
AS3303Swisscom (Schweiz) AGResidentialIPv42
AS9002RETN LimitedUnclassifiedIPv61
AS12779IT.Gate S.p.A.UnclassifiedIPv41

Transit

Downstream networks

inferred

Networks for which AS12577 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS215628Xenox IT & Kommunikations GmbHHostingIPv4 IPv6500
AS198400IP Austria Communication GmbHUnclassifiedIPv4202
AS207929IP Austria Communication GmbHUnclassifiedIPv418
AS211283Genius IT GmbHUnclassifiedIPv418
AS44832AlphaPhone Telekommunikations GmbHUnclassifiedIPv416

Adjacency

Adjacent networks

All 16

Every AS seen directly next to AS12577 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS215628Xenox IT & Kommunikations GmbHHostingIPv4 IPv6677
AS33891Core-Backbone GmbHHostingIPv4 IPv6664
AS174Cogent Communications, LLCTransitIPv4 IPv6288
AS198400IP Austria Communication GmbHUnclassifiedIPv4202
AS6939Hurricane Electric LLCTransitIPv4 IPv669
AS34549meerfarbig GmbH & Co. KGHostingIPv421
AS3303Swisscom (Schweiz) AGResidentialIPv419
AS207929IP Austria Communication GmbHUnclassifiedIPv418
AS211283Genius IT GmbHUnclassifiedIPv418
AS44832AlphaPhone Telekommunikations GmbHUnclassifiedIPv416

All 16 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-03 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.45M 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.