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AS209552Jan Siroky

BelgiumRegistryRIPE NCCTypeContent

As of 26th September 2026, AS209552 (Jan Siroky), a content network registered in Belgium with RIPE NCC, originates 7 IPv6 prefixes. It is seen behind 7 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS214757 (Jakub Krsa). 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

0

IPv6 prefixes

7

IPv4 addresses

0

IPv6 /64s

1.4M

Upstream graph

The networks AS209552 is seen behind, one and two hops out, drawn from real AS paths.

AS209552Toward the internet core
Upstream graph for AS209552: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS209552Jan SirokyThis networkAS3170VeloxServ Communi…AS6939Hurricane Electri…AS214757Jakub KrsaAS215638Cilix LimitedAS393577Tritan DevelopmentAS3257GTT Communication…AS18106Viewqwest Pte LtdAS20130Depaul UniversityAS57463NetIX Communicati…AS1299Arelion (fka. Tel…AS9002RETN LimitedAS174Cogent Communicat…

Networks observed one and two hops upstream of AS209552 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

38

adjacent networks

Upstreams
718%
Peers
3182%
Downstreams
00%

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

Upstreams of AS209552
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer20055
AS214757Jakub KrsaCZPeer17157
AS215638Cilix LimitedGBPeer4012
AS393577Tritan DevelopmentUSPeer186
AS24940Hetzner Online GmbHDEPeer41
AS3170VeloxServ Communications LtdGBPeer41
AS41051Freetransit Project (Openfactory GmbH)CHPeer44

Prefixes

The largest blocks AS209552 originates, widest first.

Largest prefixes originated by AS209552
PrefixAddressesVisibility
2a06:de01:c0::/441M × /6463/64
2602:f9ba:b3::/4865.5k × /6463/64
2a06:de01:c1::/4865.5k × /6463/64
2a06:de01:c2::/4865.5k × /6463/64
2a0b:4e07:2d::/4865.5k × /6463/64
2a0f:85c1:51::/4865.5k × /6463/64
2a13:9500:48::/4865.5k × /6463/64

Routing health

How AS209552'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%7
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%7
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv6 — 7 prefixes

  • /441M × /6414.3%1
  • /4865.5k × /6485.7%6

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS209552 started or stopped in this period.

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