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AS2546National Center of Scientific Research DEMOKRITOS

GreeceRegistryRIPE NCCTypeEyeball

As of 24th October 2026, AS2546 (National Center of Scientific Research…), an access network registered in Greece with RIPE NCC, originates 1 IPv4 prefix covering 65.5k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 3,625th-largest of the 79,664 networks we see originating IPv4, and the 13th-largest of 226 in Greece. It is seen behind 1 upstream network, most often AS5408 (National Infrastructures for Research…). 50% of its announcements have 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

1

IPv6 prefixes

1

IPv4 addresses

65.5k

IPv6 /64s

65.5k

Upstream graph

The networks AS2546 is seen behind, one and two hops out, drawn from real AS paths.

AS2546Toward the internet core
Upstream graph for AS2546: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS2546National Center o…This networkAS5408National Infrastr…AS3491PCCW Global (HK) …AS21320GEANT Vereniging

Networks observed one and two hops upstream of AS2546 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

2

adjacent networks

Upstreams
150%
Peers
150%
Downstreams
00%

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

Upstreams of AS2546
NetworkCountryRelationshipPathsVantage pts
AS5408National Infrastructures for Research and Technology S.A.GRPeer138138

Prefixes

The largest blocks AS2546 originates, widest first.

Largest prefixes originated by AS2546
PrefixAddressesVisibility
143.233.0.0/1665.5k76/76
2001:648:2120::/4865.5k × /6462/63

Routing health

How AS2546'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

  • Valid50.0%1
  • Invalid0.0%0
  • No ROA50.0%1

Propagation

  • Globally propagated90% of full-feed peers or more100.0%2
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 1 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 24th Sept 2026.

No announcement by AS2546 started or stopped in this period.

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