asn.dev

Observed topology

AS12731 IPHH IPHH Internet Port Hamburg GmbH

Unclassified ARIN NSP

Upstreams 26 carry this network
Downstreams 12 this network carries
Adjacent (IPv4) 39
Adjacent (IPv6) 28
Upstream graph Who carries AS12731, and who carries them, drawn as a map up to the transit-free core. 7 exchanges Where AS12731 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 26

Networks observed carrying traffic for AS12731: 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 IPv6280
AS6939Hurricane Electric LLCTransitIPv4 IPv6105
AS174Cogent Communications, LLCTransitIPv4 IPv665
AS3223Voxility LLPHostingIPv459
AS5405Inter.link GmbHUnclassifiedIPv4 IPv655
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv635
AS3320Deutsche Telekom AGMobileIPv4 IPv615
AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv4 IPv615
AS24482SG.GSHostingIPv4 IPv615
AS37721Virtual Technologies & SolutionsResidentialIPv4 IPv615

All 26 upstreams →

Transit

Downstream networks

All 12

Networks for which AS12731 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS60664x-ion GmbHUnclassifiedIPv4 IPv65,089
AS60926IT-Verbund Stormarn, Anstalt des oeffentlichen RechtsUnclassifiedIPv4 IPv6278
AS21235ADVANCED Systemhaus GmbHUnclassifiedIPv4 IPv6168
AS5401Daniel RoesenUnclassifiedIPv4 IPv6136
AS13157GOPAS Solutions GmbHUnclassifiedIPv4 IPv688
AS1898Torsten BlumUnclassifiedIPv460
AS209148Securepoint GmbHUnclassifiedIPv4 IPv652
AS50017fux eGUnclassifiedIPv4 IPv632
AS20144ICANNUnclassifiedIPv4 IPv67
AS2068134830.org e. V.UnclassifiedIPv63

All 12 downstreams →

Adjacency

Adjacent networks

All 43

Every AS seen directly next to AS12731 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS60664x-ion GmbHUnclassifiedIPv4 IPv65,089
AS33891Core-Backbone GmbHHostingIPv4 IPv62,730
AS6939Hurricane Electric LLCTransitIPv4 IPv6702
AS174Cogent Communications, LLCTransitIPv4 IPv6692
AS5405Inter.link GmbHUnclassifiedIPv4 IPv6563
AS60926IT-Verbund Stormarn, Anstalt des oeffentlichen RechtsUnclassifiedIPv4 IPv6278
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv6200
AS21235ADVANCED Systemhaus GmbHUnclassifiedIPv4 IPv6168
AS42708Glesys ABUnclassifiedIPv4 IPv6148
AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv4 IPv6138

All 43 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-16 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.23M 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.