subnet.im

AS203273NetCrafters OU

EstoniaRegistryRIPE NCC

As of 11th November 2026, AS203273 (NetCrafters OU), a network registered in Estonia with RIPE NCC, originates 272 IPv4 prefixes covering 70.7k addresses and 4 IPv6 prefixes. By IPv4 address space that makes it the 3,137th-largest of the 80,743 networks we see originating IPv4, and the 3rd-largest of 176 in Estonia. It is seen behind 11 upstream networks, most often AS30823 (aurologic GmbH) and AS6939 (Hurricane Electric LLC). 96% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 96% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

272

IPv6 prefixes

4

IPv4 addresses

70.7k

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…AS57304RETN RussiaAS20130Depaul UniversityAS132337AxclusiveAS6667Elisa OyjAS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS3356Lumen (Level 3)AS18106Viewqwest Pte Ltd

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

35

adjacent networks

Upstreams
1131%
Peers
2469%
Downstreams
00%

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

Upstreams of AS203273
NetworkCountryRelationshipPathsVantage pts
AS30823aurologic GmbHDEPeer13,04676
AS6939Hurricane Electric LLCUSPeer2,794134
AS57304RETN RussiaRUPeer1,61496
AS9002RETN LimitedGBPeer86283
AS31500Global Network Management IncAGPeer76257
AS207208MEVSPACE sp. z o.o.PLPeer59259
AS199599Telecom-Birzha, LLCRUPeer22926
AS3356Lumen (Level 3)USPeer1145
AS47122CYBERFIRST LLCRUPeer7676
AS216246Aeza Group LLCRUPeer404

Prefixes

All 276

The largest blocks AS203273 originates, widest first.

Largest prefixes originated by AS203273
PrefixAddressesVisibility
91.196.162.0/2351276/76
193.41.4.0/2351276/76
193.233.202.0/2351276/76
194.88.150.0/2351276/76
2.56.118.0/2425676/76
2.56.119.0/2425676/76
2.56.120.0/2425676/76
2.56.121.0/2425676/76
2.56.122.0/2425676/76
2.56.123.0/2425676/76

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

  • Valid96.4%266
  • Invalid0.0%0
  • No ROA3.6%10

Propagation

  • Globally propagated90% of full-feed peers or more96.4%266
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%3.6%10

Prefix sizes

IPv4 — 272 prefixes

IPv6 — 4 prefixes

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

Recent changes

Announcements that started or stopped since 12th Oct 2026.

136 announced and 0 withdrawn in all; the most recent are shown.

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