subnet.im

AS31563Hellenic National Meteorological Service

GreeceRegistryRIPE NCC

As of 24th October 2026, AS31563 (Hellenic National Meteorological Service), a network registered in Greece with RIPE NCC, originates 3 IPv4 prefixes covering 768 addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 44,961st-largest of the 79,664 networks we see originating IPv4, and the 108th-largest of 226 in Greece. It is seen behind 2 upstream networks, most often AS5408 (National Infrastructures for Research…) and AS3329 (Vodafone Greece). Every one of its announcements has 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

3

IPv6 prefixes

2

IPv4 addresses

768

IPv6 /64s

131k

Upstream graph

The networks AS31563 is seen behind, one and two hops out, drawn from real AS paths.

AS31563Toward the internet core
Upstream graph for AS31563: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS31563Hellenic National…This networkAS3329Vodafone GreeceAS5408National Infrastr…AS1273Vodafone Group PLCAS6939Hurricane Electri…AS3491PCCW Global (HK) …AS21320GEANT Vereniging

Networks observed one and two hops upstream of AS31563 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

4

adjacent networks

Upstreams
250%
Peers
250%
Downstreams
00%

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

Upstreams of AS31563
NetworkCountryRelationshipPathsVantage pts
AS5408National Infrastructures for Research and Technology S.A.GRPeer346138
AS3329Vodafone GreeceGRPeer63

Prefixes

The largest blocks AS31563 originates, widest first.

Largest prefixes originated by AS31563
PrefixAddressesVisibility
195.251.244.0/2425676/76
195.251.245.0/2425676/76
195.251.246.0/2425676/76
2001:648:2420::/4865.5k × /6462/63
2001:648:2421::/4865.5k × /6462/63

Routing health

How AS31563'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%5
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%5
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 3 prefixes

IPv6 — 2 prefixes

  • /4865.5k × /64100.0%2

Recent changes

Announcements that started or stopped since 24th Sept 2026.

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