asn.dev

Observed topology

AS18400 XTREME-AS-AP - Xtreme Networks Limited

Unclassified APNIC

Upstreams 3 carry this network
Downstreams 17 this network carries
Adjacent (IPv4) 20
Adjacent (IPv6) 11
Upstream graph Who carries AS18400, and who carries them, drawn as a map up to the transit-free core. 2 exchanges Where AS18400 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS18400: 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
AS56030Voyager Internet Ltd.UnclassifiedIPv4 IPv6226
AS45177DevoliResidentialIPv4 IPv6157
AS64073Vetta GroupUnclassifiedIPv4 IPv67

Transit

Downstream networks

All 17

Networks for which AS18400 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS45641Advantage LimitedUnclassifiedIPv4350
AS139020CloudLink CommunicationsUnclassifiedIPv4 IPv6162
AS45285ASN for anycast peeringHostingIPv4 IPv6137
AS132143Harbour City Security LimitedUnclassifiedIPv4130
AS13145522 Stirling StUnclassifiedIPv4129
AS136559Omega NetworksUnclassifiedIPv4 IPv6100
AS38037InternetNZ LabUnclassifiedIPv4 IPv699
AS153053Lesamoa.netHostingIPv4 IPv699
AS151475Caduceus Systems LimitedUnclassifiedIPv4 IPv698
AS136524Zylex Computers LimitedUnclassifiedIPv4 IPv679

All 17 downstreams →

Adjacency

Adjacent networks

All 20

Every AS seen directly next to AS18400 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS56030Voyager Internet Ltd.UnclassifiedIPv4 IPv61,545
AS45177DevoliResidentialIPv4 IPv6560
AS45641Advantage LimitedUnclassifiedIPv4350
AS139020CloudLink CommunicationsUnclassifiedIPv4 IPv6162
AS45285ASN for anycast peeringHostingIPv4 IPv6137
AS132143Harbour City Security LimitedUnclassifiedIPv4130
AS13145522 Stirling StUnclassifiedIPv4129
AS136559Omega NetworksUnclassifiedIPv4 IPv6100
AS38037InternetNZ LabUnclassifiedIPv4 IPv699
AS153053Lesamoa.netHostingIPv4 IPv699

All 20 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-11 10:00 UTC by route-views2,rrc00, as seen from 74 BGP vantage points across 73.24M 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.