subnet.im

AS12570O2 Czech Republic, a.s.

CzechiaRegistryRIPE NCCTypeEyeball

As of 22nd October 2026, AS12570 (O2 Czech Republic, a.s.), an access network registered in Czechia with RIPE NCC, originates 11 IPv4 prefixes covering 53.8k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 4,300th-largest of the 79,663 networks we see originating IPv4, and the 20th-largest of 572 in Czechia. It is seen behind 1 upstream network, most often AS16246 (O2 Czech Republic, a.s.), and in front of 9 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

11

IPv6 prefixes

2

IPv4 addresses

53.8k

IPv6 /64s

38.7B

Upstream graph

The networks AS12570 is seen behind, one and two hops out, drawn from real AS paths.

AS12570Toward the internet core
Upstream graph for AS12570: 2 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS12570O2 Czech Republic…This networkAS16246O2 Czech Republic…AS5610O2 Czech Republic…

Networks observed one and two hops upstream of AS12570 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

21

adjacent networks

Upstreams
15%
Peers
1152%
Downstreams
943%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS12570
NetworkCountryRelationshipPathsVantage pts
AS16246O2 Czech Republic, a.s.CZPeer2,342139

Prefixes

The largest blocks AS12570 originates, widest first.

Largest prefixes originated by AS12570
PrefixAddressesVisibility
88.83.224.0/198.2k76/77
109.105.32.0/198.2k76/77
212.4.128.0/198.2k76/77
212.96.160.0/198.2k76/77
213.211.32.0/198.2k76/77
80.78.144.0/204.1k76/77
89.190.48.0/204.1k76/77
89.190.40.0/212k76/77
185.8.188.0/221k76/77
193.17.248.0/221k76/77

Routing health

How AS12570's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid100.0%13
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%13
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 11 prefixes

IPv6 — 2 prefixes

  • /2934.4B × /6450.0%1
  • /324.3B × /6450.0%1

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

No announcement by AS12570 started or stopped in this period.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.