asn.dev

Observed topology

AS8251 NFX_ZSPO FreeTel, s.r.o.

Hosting RIPE

Upstreams 7 carry this network
Downstreams 17 this network carries
Adjacent (IPv4) 24
Adjacent (IPv6) 18
Upstream graph Who carries AS8251, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS8251 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS8251: 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 IPv6220
AS6939Hurricane Electric LLCTransitIPv4 IPv695
AS29208Quantcom, a.s.UnclassifiedIPv454
AS16019Vodafone Czech Republic a.s.UnclassifiedIPv412
AS24482SG.GSHostingIPv4 IPv67
AS29504Freenet Liberec, z.s.UnclassifiedIPv4 IPv67
AS202297Skylon Solutions LimitedUnclassifiedIPv46

Transit

Downstream networks

All 17

Networks for which AS8251 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS57707Greendata s.r.o.HostingIPv4 IPv6435
AS201608HovNet-SERVIS s.r.o.UnclassifiedIPv4 IPv6218
AS34596HVfree.net servis. s.r.o.UnclassifiedIPv4 IPv6215
AS198813SychrovNET s.r.oUnclassifiedIPv4 IPv6200
AS41670hkfree.org z.s.UnclassifiedIPv4 IPv6157
AS198977UnArtel s.r.o.UnclassifiedIPv4 IPv6156
AS49095PRAHA12.com s.r.o.UnclassifiedIPv4 IPv6155
AS59984KLFREE NETWORKS, s.r.o.UnclassifiedIPv4 IPv6127
AS12984PilsFree, z. s.UnclassifiedIPv4 IPv695
AS51400SPOJE.NET s.r.o.UnclassifiedIPv4 IPv691

All 17 downstreams →

Adjacency

Adjacent networks

All 25

Every AS seen directly next to AS8251 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS1299Arelion Sweden ABTransitIPv4 IPv61,606
AS6939Hurricane Electric LLCTransitIPv4 IPv61,164
AS49095PRAHA12.com s.r.o.UnclassifiedIPv4 IPv6656
AS57707Greendata s.r.o.HostingIPv4 IPv6589
AS29208Quantcom, a.s.UnclassifiedIPv4446
AS198813SychrovNET s.r.oUnclassifiedIPv4 IPv6314
AS201608HovNet-SERVIS s.r.o.UnclassifiedIPv4 IPv6218
AS34596HVfree.net servis. s.r.o.UnclassifiedIPv4 IPv6215
AS12984PilsFree, z. s.UnclassifiedIPv4 IPv6190
AS41670hkfree.org z.s.UnclassifiedIPv4 IPv6157

All 25 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-13 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 74.40M 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.