subnet.im

AS205090FIRST SERVER LIMITED

United KingdomRegistryRIPE NCC

As of 27th September 2026, AS205090 (FIRST SERVER LIMITED), a network registered in the United Kingdom with RIPE NCC, originates 65 IPv4 prefixes covering 16.6k addresses and 4 IPv6 prefixes. By IPv4 address space that makes it the 7,873rd-largest of the 79,525 networks we see originating IPv4, and the 220th-largest of 2,074 in the United Kingdom. It is seen behind 2 upstream networks, most often AS35196 (FIRST SERVER LIMITED) and AS50113 (FIRST SERVER LIMITED), and in front of 1 downstream network. 99% 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, and 2 prefixes are also originated by another network.

At a glance

IPv4 prefixes

65

IPv6 prefixes

4

IPv4 addresses

16.6k

IPv6 /64s

4.3B

Upstream graph

The networks AS205090 is seen behind, one and two hops out, drawn from real AS paths.

AS205090Toward the internet core
Upstream graph for AS205090: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS205090FIRST SERVER LIMI…This networkAS35196FIRST SERVER LIMI…AS50113FIRST SERVER LIMI…AS202984Team-Host (Cherny…AS35598INETCOM CARRIER L…AS31500Global Network Ma…

Networks observed one and two hops upstream of AS205090 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

5

adjacent networks

Upstreams
240%
Peers
240%
Downstreams
120%

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

Upstreams of AS205090
NetworkCountryRelationshipPathsVantage pts
AS35196FIRST SERVER LIMITEDGBPeer5,115145
AS50113FIRST SERVER LIMITEDGBPeer40581

Prefixes

All 69

The largest blocks AS205090 originates, widest first.

Largest prefixes originated by AS205090
PrefixAddressesVisibility
45.9.73.0/2425681/81
45.9.75.0/2425681/81
45.89.65.0/2425681/81
45.90.216.0/2425681/81
45.90.217.0/2425681/81
45.90.218.0/2425681/81
45.90.219.0/2425681/81
45.95.202.0/2425681/81
45.95.203.0/2425681/81
45.132.255.0/2425681/81

Routing health

How AS205090'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

  • Valid98.6%68
  • Invalid0.0%0
  • No ROA1.4%1

Propagation

  • Globally propagated90% of full-feed peers or more100.0%69
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 65 prefixes

IPv6 — 4 prefixes

  • /324.3B × /6425.0%1
  • /4865.5k × /6475.0%3

Recent changes

Announcements that started or stopped since 28th Aug 2026.

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