asn.dev

Observed topology

AS1257 TELE2

Mobile RIPE

Upstreams 23 carry this network
Downstreams 320 this network carries
Adjacent (IPv4) 337
Adjacent (IPv6) 201
Upstream graph Who carries AS1257, and who carries them, drawn as a map up to the transit-free core. 9 exchanges Where AS1257 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 23

Networks observed carrying traffic for AS1257: 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
AS1299Arelion Sweden ABTransitIPv4 IPv64,604
AS6939Hurricane Electric LLCTransitIPv4 IPv63,583
AS2914NTT America, Inc.TransitIPv4 IPv63,191
AS9002RETN LimitedUnclassifiedIPv4 IPv62,686
AS174Cogent Communications, LLCTransitIPv4 IPv62,460
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4 IPv6964
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv6348
AS3303Swisscom (Schweiz) AGResidentialIPv4 IPv6347
AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv4 IPv6344
AS42708Glesys ABUnclassifiedIPv4 IPv6344

All 23 upstreams →

Transit

Downstream networks

All 320

Networks for which AS1257 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS174Cogent Communications, LLCTransitIPv4 IPv64,226
AS35041Binero ABHostingIPv4 IPv62,472
AS4837CHINA UNICOM China169 BackboneMobileIPv4 IPv62,110
AS202296MicroGroup Europe ABUnclassifiedIPv41,986
AS12597Gotalandsnatet ABUnclassifiedIPv4 IPv61,882
AS9009M247 Europe SRLHostingIPv4 IPv61,840
AS714Apple Inc.HostingIPv4 IPv61,704
AS2914NTT America, Inc.TransitIPv41,647
AS8075Microsoft CorporationHostingIPv4 IPv61,314
AS28854SavMAN ABUnclassifiedIPv4 IPv61,284

All 320 downstreams →

Adjacency

Adjacent networks

All 337

Every AS seen directly next to AS1257 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv4 IPv6390,588
AS1299Arelion Sweden ABTransitIPv4 IPv6144,560
AS174Cogent Communications, LLCTransitIPv4 IPv657,965
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4 IPv653,820
AS6461Zayo BandwidthTransitIPv4 IPv633,582
AS2914NTT America, Inc.TransitIPv4 IPv626,001
AS4134No.31,Jin-rong StreetResidentialIPv4 IPv625,500
AS12956TELEFONICA GLOBAL SOLUTIONS SLTransitIPv4 IPv621,211
AS4837CHINA UNICOM China169 BackboneMobileIPv4 IPv69,641
AS4637Telstra GlobalUnclassifiedIPv48,653

All 337 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-20 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.16M 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.