subnet.im

AS200454Tomas Oliveira Valente Leite de Castro

PortugalRegistryRIPE NCCTypeEyeball

As of 27th September 2026, AS200454 (Tomas Oliveira Valente Leite de Castro), an access network registered in Portugal with RIPE NCC, originates 2 IPv4 prefixes covering 512 addresses and 3 IPv6 prefixes. By IPv4 address space that makes it the 48,553rd-largest of the 79,516 networks we see originating IPv4, and the 66th-largest of 126 in Portugal. It is seen behind 3 upstream networks, most often AS12186 (GVVME) and AS6939 (Hurricane Electric LLC), and in front of 2 downstream networks. 60% 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

2

IPv6 prefixes

3

IPv4 addresses

512

IPv6 /64s

16.9M

Upstream graph

The networks AS200454 is seen behind, one and two hops out, drawn from real AS paths.

AS200454Toward the internet core
Upstream graph for AS200454: 9 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS200454Tomas Oliveira Va…This networkAS6939Hurricane Electri…AS12186GVVMEAS50666LigaT Telecom Soc…AS18106Viewqwest Pte LtdAS20130Depaul UniversityAS174Cogent Communicat…AS1299Arelion (fka. Tel…AS3257GTT Communication…AS49600NEAR IP, S.L.

Networks observed one and two hops upstream of AS200454 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

114

adjacent networks

Upstreams
33%
Peers
10996%
Downstreams
22%

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

Upstreams of AS200454
NetworkCountryRelationshipPathsVantage pts
AS12186GVVMEUSPeer287143
AS6939Hurricane Electric LLCUSPeer14271
AS50666LigaT Telecom Sociedade Unipessoal LDAPTPeer8181

Prefixes

The largest blocks AS200454 originates, widest first.

Largest prefixes originated by AS200454
PrefixAddressesVisibility
23.147.168.0/2425681/81
131.143.87.0/2425680/81
2a0a:6040:aa00::/4016.8M × /6463/64
2602:faa5::/4865.5k × /6463/64
2a0f:b241:10::/4865.5k × /6463/64

Routing health

How AS200454'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

  • Valid60.0%3
  • Invalid0.0%0
  • No ROA40.0%2

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 — 2 prefixes

IPv6 — 3 prefixes

  • /4016.8M × /6433.3%1
  • /4865.5k × /6466.7%2

Recent changes

Announcements that started or stopped since 28th Aug 2026.

  • Announced2602:faa5::/4822nd Sept 2026
  • Withdrawn199.16.240.0/2221st Sept 2026
  • Withdrawn2602:faa5::/3621st Sept 2026

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