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AS204154FIRST SERVER LIMITED

United KingdomRegistryRIPE NCC

As of 11th November 2026, AS204154 (FIRST SERVER LIMITED), a network registered in the United Kingdom with RIPE NCC, originates 7 IPv4 prefixes covering 2.3k addresses and 3 IPv6 prefixes. By IPv4 address space that makes it the 24,593rd-largest of the 80,743 networks we see originating IPv4, and the 733rd-largest of 2,122 in the United Kingdom. It is seen behind 2 upstream networks, most often AS395839 (HOSTKEY) and AS8849 (Melbikomas UAB). Every one of its announcements has 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

7

IPv6 prefixes

3

IPv4 addresses

2.3k

IPv6 /64s

197k

Upstream graph

The networks AS204154 is seen behind, one and two hops out, drawn from real AS paths.

AS204154Toward the internet core
Upstream graph for AS204154: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS204154FIRST SERVER LIMI…This networkAS8849Melbikomas UABAS395839HOSTKEYAS4637Telstra Internati…AS6453TATA Communicatio…AS3257GTT Communication…AS6939Hurricane Electri…

Networks observed one and two hops upstream of AS204154 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 AS204154
NetworkCountryRelationshipPathsVantage pts
AS395839HOSTKEYUSPeer443139
AS8849Melbikomas UABLTPeer276138

Prefixes

The largest blocks AS204154 originates, widest first.

Largest prefixes originated by AS204154
PrefixAddressesVisibility
46.8.180.0/2351276/76
132.243.28.0/2351276/76
45.86.47.0/2425676/76
46.17.107.0/2425676/76
92.118.10.0/2425676/76
185.172.129.0/2425676/76
185.200.191.0/2425676/76
2a04:5201:1::/4865.5k × /6463/63
2a0c:5d00:3009::/4865.5k × /6462/63
2a0c:5d00:ff07::/4865.5k × /6462/63

Routing health

How AS204154'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%10
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%10
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 7 prefixes

IPv6 — 3 prefixes

  • /4865.5k × /64100.0%3

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS204154 started or stopped in this period.

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