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AS204997FIRST SERVER LIMITED

United KingdomRegistryRIPE NCC

As of 27th September 2026, AS204997 (FIRST SERVER LIMITED), a network registered in the United Kingdom with RIPE NCC, originates 64 IPv4 prefixes covering 16.4k addresses and 16 IPv6 prefixes. By IPv4 address space that makes it the 7,959th-largest of the 79,525 networks we see originating IPv4, and the 221st-largest of 2,074 in the United Kingdom. It is seen behind 1 upstream network, most often AS50113 (FIRST SERVER LIMITED). 99% of its announcements have a valid RPKI ROA; 1 is RPKI-invalid. 99% of its routes reach at least 90% of full-feed peers, and 1 prefix is also originated by another network.

At a glance

IPv4 prefixes

64

IPv6 prefixes

16

IPv4 addresses

16.4k

IPv6 /64s

1M

Upstream graph

The networks AS204997 is seen behind, one and two hops out, drawn from real AS paths.

AS204997Toward the internet core
Upstream graph for AS204997: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS204997FIRST SERVER LIMI…This networkAS50113FIRST SERVER LIMI…AS31500Global Network Ma…AS35598INETCOM CARRIER L…

Networks observed one and two hops upstream of AS204997 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

2

adjacent networks

Upstreams
150%
Peers
150%
Downstreams
00%

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

Upstreams of AS204997
NetworkCountryRelationshipPathsVantage pts
AS50113FIRST SERVER LIMITEDGBPeer6,150145

Prefixes

All 80

The largest blocks AS204997 originates, widest first.

Largest prefixes originated by AS204997
PrefixAddressesVisibility
45.144.64.0/2425681/81
45.144.65.0/2425681/81
45.144.66.0/2425681/81
45.144.67.0/2425681/81
46.17.104.0/2425681/81
91.217.81.0/2425681/81
104.128.132.0/2425681/81
104.128.136.0/2425681/81
104.128.137.0/2425681/81
104.128.140.0/2425681/81

Routing health

How AS204997'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

  • Valid98.8%79
  • Invalid1.3%1
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more98.8%79
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%1.3%1

Prefix sizes

IPv4 — 64 prefixes

IPv6 — 16 prefixes

  • /4865.5k × /64100.0%16

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.