Observed topology

AS12570 ITSELF O2 Czech Republic, a.s.

Unclassified RIPE

Upstreams 1 carry this network

Downstreams 8 this network carries

Adjacent (IPv4) 10

Adjacent (IPv6) 3

Upstream graph Who carries AS12570, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS12570 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS12570: 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.

AS	Network	Type	Families	Paths seen
AS16246	O2 Czech Republic, a.s.	Unclassified	IPv4 IPv6	721

Transit

Downstream networks

inferred

Networks for which AS12570 was observed as the last hop before the origin, meaning it appears to provide them transit.

AS	Network	Type	Families	Paths seen
AS213354	Iryna Oliinyk	Unclassified	IPv4 IPv6	381
AS51424	Jiri Sperl	Unclassified	IPv4	240
AS204886	Metropolitni sit Humpolec spol. s r.o.	Unclassified	IPv4 IPv6	90
AS196815	LAN servis s.r.o.	Unclassified	IPv4	60
AS198620	Bralu Jurjanu biedriba	Unclassified	IPv4	59
AS211334	MASTER IT Technologies, a.s.	Unclassified	IPv4	59
AS25192	CZ.NIC, z.s.p.o.	Unclassified	IPv4	43
AS202979	NGA Services, spol. s r.o.	Unclassified	IPv4	1

Adjacency

Adjacent networks

observed

Every AS seen directly next to AS12570 in a routing path, in either direction.

AS	Network	Type	Families	Paths seen
AS16246	O2 Czech Republic, a.s.	Unclassified	IPv4 IPv6	1,655
AS213354	Iryna Oliinyk	Unclassified	IPv4 IPv6	381
AS51424	Jiri Sperl	Unclassified	IPv4	240
AS204886	Metropolitni sit Humpolec spol. s r.o.	Unclassified	IPv4 IPv6	90
AS196815	LAN servis s.r.o.	Unclassified	IPv4	60
AS198620	Bralu Jurjanu biedriba	Unclassified	IPv4	59
AS211334	MASTER IT Technologies, a.s.	Unclassified	IPv4	59
AS25192	CZ.NIC, z.s.p.o.	Unclassified	IPv4	43
AS47232	ISP Alliance a.s.	Residential	IPv4	1
AS202979	NGA Services, spol. s r.o.	Unclassified	IPv4	1

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.