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AS204339FIRST SERVER LIMITED

United KingdomRegistryRIPE NCC

As of 11th November 2026, AS204339 (FIRST SERVER LIMITED), a network registered in the United Kingdom with RIPE NCC, originates 56 IPv4 prefixes covering 14.3k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 8,819th-largest of the 80,743 networks we see originating IPv4, and the 264th-largest of 2,122 in the United Kingdom. It is seen behind 2 upstream networks, most often AS214602 (AI DATACENTER LIMITED) and AS50113 (FIRST SERVER LIMITED). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 98% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

56

IPv6 prefixes

2

IPv4 addresses

14.3k

IPv6 /64s

131k

Upstream graph

The networks AS204339 is seen behind, one and two hops out, drawn from real AS paths.

AS204339Toward the internet core
Upstream graph for AS204339: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS204339FIRST SERVER LIMI…This networkAS50113FIRST SERVER LIMI…AS214602AI DATACENTER LIM…AS1299Arelion (fka. Tel…AS35598INETCOM CARRIER L…AS9002RETN LimitedAS51765Oy Crea Nova Host…

Networks observed one and two hops upstream of AS204339 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 AS204339
NetworkCountryRelationshipPathsVantage pts
AS214602AI DATACENTER LIMITEDGBPeer4,056134
AS50113FIRST SERVER LIMITEDGBPeer29917

Prefixes

All 58

The largest blocks AS204339 originates, widest first.

Largest prefixes originated by AS204339
PrefixAddressesVisibility
45.9.72.0/2425676/76
45.132.252.0/2425676/76
45.138.73.0/2425676/76
45.138.74.0/2425676/76
46.8.96.0/2425676/76
46.8.178.0/2425676/76
46.8.179.0/2425676/76
46.8.218.0/2425676/76
46.17.105.0/2425676/76
83.147.194.0/2425676/76

Routing health

How AS204339'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%58
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more98.3%57
  • Partially propagated40% to 90%1.7%1
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 56 prefixes

IPv6 — 2 prefixes

  • /4865.5k × /64100.0%2

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.