subnet.im

AS205090FIRST SERVER LIMITED

United KingdomRegistryRIPE NCC

As of 11th November 2026, AS205090 (FIRST SERVER LIMITED), a network registered in the United Kingdom with RIPE NCC, originates 68 IPv4 prefixes covering 17.4k addresses and 5 IPv6 prefixes. By IPv4 address space that makes it the 7,772nd-largest of the 80,743 networks we see originating IPv4, and the 224th-largest of 2,122 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. 97% 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

68

IPv6 prefixes

5

IPv4 addresses

17.4k

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…AS1299Arelion (fka. Tel…

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 LIMITEDGBPeer5,102139
AS50113FIRST SERVER LIMITEDGBPeer38076

Prefixes

All 73

The largest blocks AS205090 originates, widest first.

Largest prefixes originated by AS205090
PrefixAddressesVisibility
45.9.73.0/2425676/76
45.9.75.0/2425676/76
45.89.65.0/2425676/76
45.90.216.0/2425676/76
45.90.217.0/2425676/76
45.90.218.0/2425676/76
45.90.219.0/2425676/76
45.95.202.0/2425676/76
45.95.203.0/2425676/76
45.132.255.0/2425676/76

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%72
  • Invalid0.0%0
  • No ROA1.4%1

Propagation

  • Globally propagated90% of full-feed peers or more97.3%71
  • Partially propagated40% to 90%2.7%2
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 68 prefixes

IPv6 — 5 prefixes

  • /324.3B × /6420.0%1
  • /4865.5k × /6480.0%4

Recent changes

Announcements that started or stopped since 12th Oct 2026.

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