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AS209554ISIF OU

EstoniaRegistryRIPE NCC

As of 27th September 2026, AS209554 (ISIF OU), a network registered in Estonia with RIPE NCC, originates 27 IPv4 prefixes covering 11k addresses and 73 IPv6 prefixes. By IPv4 address space that makes it the 10,010th-largest of the 79,525 networks we see originating IPv4, and the 16th-largest of 172 in Estonia. It is seen behind 7 upstream networks, most often AS4743 (ISIF LIMITED) and AS49304 (SAKURA LINK LIMITED), and in front of 5 downstream networks. 66% of its announcements have a valid RPKI ROA; 18 are RPKI-invalid. 51% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

27

IPv6 prefixes

73

IPv4 addresses

11k

IPv6 /64s

77.7M

Upstream graph

The networks AS209554 is seen behind, one and two hops out, drawn from real AS paths.

AS209554Toward the internet core
Upstream graph for AS209554: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS209554ISIF OUThis networkAS3204xTom OUAS4743ISIF LIMITEDAS7720Skywolf Technolog…AS7768Nuh Ahmet Firat t…AS49304SAKURA LINK LIMIT…AS3214xTom GmbHAS9002RETN LimitedAS10111Zeofast NetworkAS17433Hytron Network Se…AS9516SAKURA LINK LIMIT…AS44901Belcloud LTDAS6939Hurricane Electri…

Networks observed one and two hops upstream of AS209554 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

32

adjacent networks

Upstreams
722%
Peers
2063%
Downstreams
516%

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

Upstreams of AS209554
NetworkCountryRelationshipPathsVantage pts
AS4743ISIF LIMITEDHKPeer3,341145
AS49304SAKURA LINK LIMITEDHKPeer1,332144
AS3204xTom OUEEPeer11961
AS7720Skywolf Technology LLCUSPeer6663
AS25091IP-Max SACHPeer21
AS8298IPng Networks GmbHCHPeer21
AS7768Nuh Ahmet Firat trading as TEKNET YAZILIM VE BILGISAYAR TEKNOLOJILERITRPeer21

Prefixes

All 100

The largest blocks AS209554 originates, widest first.

Largest prefixes originated by AS209554
PrefixAddressesVisibility
152.175.4.0/221k81/81
152.175.8.0/221k81/81
152.175.12.0/221k81/81
152.175.16.0/221k81/81
152.175.4.0/2351244/81
152.175.6.0/2351244/81
152.175.8.0/2351244/81
152.175.10.0/2351245/81
45.95.212.0/2425680/81
152.175.1.0/2425681/81

Routing health

How AS209554'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

  • Valid66.0%66
  • Invalid18.0%18
  • No ROA16.0%16

Propagation

  • Globally propagated90% of full-feed peers or more51.0%51
  • Partially propagated40% to 90%7.0%7
  • Seen by few peersUnder 40%42.0%42

Prefix sizes

IPv4 — 27 prefixes

IPv6 — 73 prefixes

  • /4016.8M × /642.7%2
  • /441M × /6453.4%39
  • /45524k × /641.4%1
  • /46262k × /642.7%2
  • /47131k × /646.8%5
  • /4865.5k × /6432.9%24

Recent changes

Announcements that started or stopped since 28th Aug 2026.

10 announced and 4 withdrawn in all; the most recent are shown.

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