asn.dev

Observed topology

AS42739 FONE-ASN

Unclassified RIPE

Upstreams 19 carry this network
Downstreams 32 this network carries
Adjacent (IPv4) 52
Adjacent (IPv6) 23
Upstream graph Who carries AS42739, and who carries them, drawn as a map up to the transit-free core. 6 exchanges Where AS42739 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 19

Networks observed carrying traffic for AS42739: 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
AS3356Level 3 Parent, LLCTransitIPv4 IPv6145
AS6461Zayo BandwidthTransitIPv4 IPv6105
AS5405Inter.link GmbHUnclassifiedIPv4 IPv691
AS174Cogent Communications, LLCTransitIPv4 IPv668
AS6939Hurricane Electric LLCTransitIPv4 IPv668
AS57463NetIX Communications JSCUnclassifiedIPv4 IPv666
AS5511Orange S.A.TransitIPv435
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv622
AS50263A-Systems Sp. z o.o.UnclassifiedIPv4 IPv619
AS24482SG.GSHostingIPv4 IPv613

All 19 upstreams →

Transit

Downstream networks

All 32

Networks for which AS42739 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS47544IQ PL Sp. z o.o.HostingIPv4 IPv6514
AS50840Marek Bajerski trading as HITME.PLUnclassifiedIPv4 IPv6447
AS197226"SPRINT" S.A.HostingIPv4 IPv6422
AS197615NaszaSiec.NET Krakow Damian MurzynowskiResidentialIPv4306
AS35745Provector Sp. z o.oUnclassifiedIPv4 IPv6261
AS199234Komputerowe Studio Grafiki, Wojciech LisUnclassifiedIPv4 IPv6238
AS203828DSS OPERATOR SPOLKA AKCYJNAUnclassifiedIPv4189
AS41385KONIN-MIASTO NA PRAWACH POWIATUUnclassifiedIPv4180
AS204782MARCIN SEBASTIAN ZIOLEK trading as MATCOMUnclassifiedIPv4180
AS206896TOPDATA SP. Z 0.0.UnclassifiedIPv4160

All 32 downstreams →

Adjacency

Adjacent networks

All 52

Every AS seen directly next to AS42739 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS6461Zayo BandwidthTransitIPv4 IPv61,228
AS5405Inter.link GmbHUnclassifiedIPv4 IPv6815
AS3356Level 3 Parent, LLCTransitIPv4 IPv6604
AS47544IQ PL Sp. z o.o.HostingIPv4 IPv6576
AS174Cogent Communications, LLCTransitIPv4 IPv6510
AS50840Marek Bajerski trading as HITME.PLUnclassifiedIPv4 IPv6447
AS197226"SPRINT" S.A.HostingIPv4 IPv6422
AS57463NetIX Communications JSCUnclassifiedIPv4 IPv6359
AS35745Provector Sp. z o.oUnclassifiedIPv4 IPv6350
AS6939Hurricane Electric LLCTransitIPv4 IPv6316

All 52 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-21 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.14M 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.