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AS205621Zentria OU

EstoniaRegistryRIPE NCCTypeContent

As of 11th November 2026, AS205621 (Zentria OU), a content network registered in Estonia with RIPE NCC, originates 2 IPv4 prefixes covering 512 addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 49,320th-largest of the 80,747 networks we see originating IPv4, and the 97th-largest of 176 in Estonia. It is seen behind 2 upstream networks, most often AS20473 (The Constant Company, LLC) and AS56662 (Marcin Gondek). 67% of its announcements have a valid RPKI ROA; 1 is RPKI-invalid. 67% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

2

IPv6 prefixes

1

IPv4 addresses

512

IPv6 /64s

65.5k

Upstream graph

The networks AS205621 is seen behind, one and two hops out, drawn from real AS paths.

AS205621Toward the internet core
Upstream graph for AS205621: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS205621Zentria OUThis networkAS20473The Constant Comp…AS56662Marcin GondekAS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS13030Init7 (Switzerlan…AS25091IP-Max SA

Networks observed one and two hops upstream of AS205621 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

5

adjacent networks

Upstreams
240%
Peers
360%
Downstreams
00%

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

Upstreams of AS205621
NetworkCountryRelationshipPathsVantage pts
AS20473The Constant Company, LLCUSPeer138137
AS56662Marcin GondekPLPeer11

Prefixes

The largest blocks AS205621 originates, widest first.

Largest prefixes originated by AS205621
PrefixAddressesVisibility
62.144.56.0/2425676/76
194.77.38.0/242561/76
2a0e:97c0:3c1::/4865.5k × /6462/63

Routing health

How AS205621'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

  • Valid66.7%2
  • Invalid33.3%1
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more66.7%2
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%33.3%1

Prefix sizes

IPv4 — 2 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 12th Oct 2026.

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