asn.dev

Observed topology

AS819 LARG-NET - LARG*net London and Region Global Computer Network

Unclassified ARIN

Upstreams 11 carry this network
Downstreams 6 this network carries
Adjacent (IPv4) 15
Adjacent (IPv6) 10
Upstream graph Who carries AS819, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS819 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 11

Networks observed carrying traffic for AS819: 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
AS19752Hydro One Telecom Inc.UnclassifiedIPv4542
AS6939Hurricane Electric LLCTransitIPv4 IPv6439
AS174Cogent Communications, LLCTransitIPv4 IPv660
AS26677ORIONUnclassifiedIPv460
AS3257GTT Communications Inc.TransitIPv4 IPv643
AS22652Videotron LteeResidentialIPv4 IPv619
AS24482SG.GSHostingIPv4 IPv610
AS394256Tech Futures Interactive Inc.UnclassifiedIPv4 IPv610
AS3303Swisscom (Schweiz) AGResidentialIPv49
AS1403EBOXResidentialIPv62

All 11 upstreams →

Transit

Downstream networks

inferred

Networks for which AS819 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS823University of Western OntarioUnclassifiedIPv4 IPv6916
AS822St. Joseph's Health Care, LondonUnclassifiedIPv4326
AS397264City of LondonUnclassifiedIPv4 IPv684
AS394554Woodstock General HospitalUnclassifiedIPv466
AS395235St. Thomas-Elgin General HospitalUnclassifiedIPv466
AS14933London HydroUnclassifiedIPv433

Adjacency

Adjacent networks

All 17

Every AS seen directly next to AS819 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS6939Hurricane Electric LLCTransitIPv4 IPv61,260
AS823University of Western OntarioUnclassifiedIPv4 IPv6916
AS19752Hydro One Telecom Inc.UnclassifiedIPv4571
AS26677ORIONUnclassifiedIPv4425
AS822St. Joseph's Health Care, LondonUnclassifiedIPv4326
AS174Cogent Communications, LLCTransitIPv4 IPv6168
AS3257GTT Communications Inc.TransitIPv4 IPv6122
AS397264City of LondonUnclassifiedIPv4 IPv684
AS394554Woodstock General HospitalUnclassifiedIPv466
AS395235St. Thomas-Elgin General HospitalUnclassifiedIPv466

All 17 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-02 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.44M 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.