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AS203273NetCrafters OU

EstoniaRegistryRIPE NCC

As of 26th September 2026, AS203273 (NetCrafters OU), a network registered in Estonia with RIPE NCC, originates 137 IPv4 prefixes covering 36.1k addresses and 4 IPv6 prefixes. By IPv4 address space that makes it the 5,158th-largest of the 79,516 networks we see originating IPv4, and the 7th-largest of 172 in Estonia. It is seen behind 10 upstream networks, most often AS30823 (aurologic GmbH) and AS6939 (Hurricane Electric LLC). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. Over 99% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

137

IPv6 prefixes

4

IPv4 addresses

36.1k

IPv6 /64s

805M

Upstream graph

The networks AS203273 is seen behind, one and two hops out, drawn from real AS paths.

AS203273Toward the internet core
Upstream graph for AS203273: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS203273NetCrafters OUThis networkAS6939Hurricane Electri…AS9002RETN LimitedAS30823aurologic GmbHAS31500Global Network Ma…AS207208MEVSPACE sp. z o.…AS18106Viewqwest Pte LtdAS20130Depaul UniversityAS6453TATA Communicatio…AS51907Kanton ZugAS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS1273Vodafone Group PLC

Networks observed one and two hops upstream of AS203273 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
1031%
Peers
2269%
Downstreams
00%

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

Upstreams of AS203273
NetworkCountryRelationshipPathsVantage pts
AS30823aurologic GmbHDEPeer6,17981
AS6939Hurricane Electric LLCUSPeer2,734140
AS9002RETN LimitedGBPeer86899
AS31500Global Network Management IncAGPeer634115
AS207208MEVSPACE sp. z o.o.PLPeer62762
AS199599Telecom-Birzha, LLCRUPeer14036
AS3356Lumen (Level 3)USPeer1014
AS57304RETN RussiaRUPeer2424
AS24940Hetzner Online GmbHDEPeer91
AS216246Aeza Group LLCRUPeer33

Prefixes

All 141

The largest blocks AS203273 originates, widest first.

Largest prefixes originated by AS203273
PrefixAddressesVisibility
91.196.162.0/2351281/81
193.41.4.0/2351281/81
193.233.202.0/2351281/81
194.88.150.0/2351281/81
2.56.118.0/2425681/81
2.56.119.0/2425681/81
2.56.120.0/2425681/81
2.56.121.0/2425681/81
2.56.122.0/2425681/81
2.56.123.0/2425681/81

Routing health

How AS203273'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%141
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more99.3%140
  • Partially propagated40% to 90%0.7%1
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 137 prefixes

IPv6 — 4 prefixes

  • /36268M × /6475.0%3
  • /4865.5k × /6425.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

50 announced and 2 withdrawn in all; the most recent are shown.

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