subnet.im

AS202131ISP Alliance a.s.

CzechiaRegistryRIPE NCC

As of 10th November 2026, AS202131 (ISP Alliance a.s.), a network registered in Czechia with RIPE NCC, originates 1 IPv4 prefix covering 512 addresses. By IPv4 address space that makes it the 49,312th-largest of the 80,733 networks we see originating IPv4, and the 454th-largest of 576 in Czechia. It is seen behind 1 upstream network, most often AS47232 (ISP Alliance a.s.). 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

1

IPv6 prefixes

0

IPv4 addresses

512

IPv6 /64s

0

Upstream graph

The networks AS202131 is seen behind, one and two hops out, drawn from real AS paths.

AS202131Toward the internet core
Upstream graph for AS202131: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS202131ISP Alliance a.s.This networkAS47232ISP Alliance a.s.AS1299Arelion (fka. Tel…AS6939Hurricane Electri…

Networks observed one and two hops upstream of AS202131 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

2

adjacent networks

Upstreams
150%
Peers
150%
Downstreams
00%

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

Upstreams of AS202131
NetworkCountryRelationshipPathsVantage pts
AS47232ISP Alliance a.s.CZPeer7676

Prefixes

The largest blocks AS202131 originates, widest first.

Largest prefixes originated by AS202131
PrefixAddressesVisibility
185.52.172.0/2351276/76

Routing health

How AS202131'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%1
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%1
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 1 prefixes

Recent changes

Announcements that started or stopped since 11th Oct 2026.

No announcement by AS202131 started or stopped in this period.

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