asn.dev

Observed topology

AS3300 BT British Telecommunications Limited

Residential DROP-listed space RIPE

Upstreams 26 carry this network
Downstreams 19 this network carries
Adjacent (IPv4) 45
Adjacent (IPv6) 24
Upstream graph Who carries AS3300, and who carries them, drawn as a map up to the transit-free core. 17 exchanges Where AS3300 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 26

Networks observed carrying traffic for AS3300: 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
AS2914NTT America, Inc.TransitIPv4 IPv61,697
AS1299Arelion Sweden ABTransitIPv4 IPv61,522
AS6939Hurricane Electric LLCTransitIPv4 IPv61,230
AS4637Telstra GlobalUnclassifiedIPv4 IPv6871
AS3491PCCW Global (HK) Ltd.TransitIPv4 IPv6604
AS9002RETN LimitedUnclassifiedIPv4 IPv6501
AS4657StarHub LtdResidentialIPv4 IPv6288
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv6252
AS1403EBOXResidentialIPv4 IPv6198
AS22652Videotron LteeResidentialIPv4 IPv6183

All 26 upstreams →

Transit

Downstream networks

All 19

Networks for which AS3300 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS7246Bristol-Myers Squibb CompanyUnclassifiedIPv4 IPv6562
AS72Schlumberger LimitedUnclassifiedIPv4285
AS136767BMW AG (Bayerische Motoren Werke Aktiengesellschaft)UnclassifiedIPv4 IPv6275
AS22683Koninklijke Philips N.V.UnclassifiedIPv4228
AS18872Veritas Technologies LLCUnclassifiedIPv4 IPv6202
AS40659BMW of North America, LLC (Group Data Centers America)UnclassifiedIPv4 IPv6178
AS78BT Americas, IncUnclassifiedIPv4171
AS399449KyndrylUnclassifiedIPv4171
AS141399Specsavers Pty LtdUnclassifiedIPv4116
AS212565Specsavers Optical Group LimitedUnclassifiedIPv4116

All 19 downstreams →

Adjacency

Adjacent networks

All 46

Every AS seen directly next to AS3300 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS2914NTT America, Inc.TransitIPv4 IPv62,177
AS1299Arelion Sweden ABTransitIPv4 IPv62,129
AS6939Hurricane Electric LLCTransitIPv4 IPv61,611
AS4637Telstra GlobalUnclassifiedIPv4 IPv61,224
AS3491PCCW Global (HK) Ltd.TransitIPv4 IPv6781
AS4657StarHub LtdResidentialIPv4 IPv6654
AS9002RETN LimitedUnclassifiedIPv4 IPv6612
AS7246Bristol-Myers Squibb CompanyUnclassifiedIPv4 IPv6562
AS72Schlumberger LimitedUnclassifiedIPv4285
AS136767BMW AG (Bayerische Motoren Werke Aktiengesellschaft)UnclassifiedIPv4 IPv6275

All 46 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-07 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 72.97M 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.