asn.dev

Observed topology

AS3303 SWISSCOM Swisscom Switzerland Ltd

Residential ARIN Cable/DSL/ISP

Upstreams 56 carry this network
Downstreams 1,183 this network carries
Adjacent (IPv4) 1,224
Adjacent (IPv6) 287
Upstream graph Who carries AS3303, and who carries them, drawn as a map up to the transit-free core. 64 exchanges Where AS3303 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 56

Networks observed carrying traffic for AS3303: 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
AS6939Hurricane Electric LLCTransitIPv4 IPv62,051
AS3320Deutsche Telekom AGMobileIPv4 IPv61,516
AS3356Level 3 Parent, LLCTransitIPv4 IPv61,207
AS3257GTT Communications Inc.TransitIPv4 IPv6929
AS2914NTT America, Inc.TransitIPv4 IPv6920
AS174Cogent Communications, LLCTransitIPv4582
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv6570
AS1403EBOXResidentialIPv4 IPv6394
AS1836green.ch AGResidentialIPv4 IPv6390
AS34019Hivane AssociationUnclassifiedIPv4 IPv6389

All 56 upstreams →

Transit

Downstream networks

All 1,183

Networks for which AS3303 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS9498BHARTI Airtel Ltd.MobileIPv45,046
AS16509Amazon.com, Inc.HostingIPv43,120
AS7029Windstream Communications LLCResidentialIPv4 IPv63,117
AS6079RCNResidentialIPv42,841
AS12874Fastweb SpAResidentialIPv4 IPv62,285
AS4766Korea TelecomMobileIPv42,161
AS174Cogent Communications, LLCTransitIPv42,074
AS4837CHINA UNICOM China169 BackboneMobileIPv4 IPv61,826
AS3257GTT Communications Inc.TransitIPv41,765
AS2914NTT America, Inc.TransitIPv41,681

All 1,183 downstreams →

Adjacency

Adjacent networks

All 1,224

Every AS seen directly next to AS3303 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS6939Hurricane Electric LLCTransitIPv4 IPv6209,613
AS3356Level 3 Parent, LLCTransitIPv4 IPv6168,968
AS2914NTT America, Inc.TransitIPv493,053
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4 IPv677,028
AS174Cogent Communications, LLCTransitIPv469,814
AS3257GTT Communications Inc.TransitIPv4 IPv666,216
AS34019Hivane AssociationUnclassifiedIPv4 IPv653,142
AS58453China Mobile International LimitedUnclassifiedIPv4 IPv646,241
AS3491PCCW Global (HK) Ltd.TransitIPv4 IPv622,713
AS9002RETN LimitedUnclassifiedIPv421,602

All 1,224 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-31 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.50M 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.