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AS215821London Digital Systems LTD

United KingdomRegistryRIPE NCC

As of 25th October 2026, AS215821 (London Digital Systems LTD), a network registered in the United Kingdom with RIPE NCC, originates 3 IPv4 prefixes covering 768 addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 44,959th-largest of the 79,675 networks we see originating IPv4, and the 1,251st-largest of 2,079 in the United Kingdom. It is seen behind 2 upstream networks, most often AS24875 (NovoServe B.V.) and AS211826 (Stability for Integrated Server Hosting…). 75% 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.

At a glance

IPv4 prefixes

3

IPv6 prefixes

1

IPv4 addresses

768

IPv6 /64s

65.5k

Upstream graph

The networks AS215821 is seen behind, one and two hops out, drawn from real AS paths.

AS215821Toward the internet core
Upstream graph for AS215821: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS215821London Digital Sy…This networkAS24875NovoServe B.V.AS211826Stability for Int…AS2914NTT America, Inc.AS5405Inter.link GmbHAS1299Arelion (fka. Tel…AS3257GTT Communication…

Networks observed one and two hops upstream of AS215821 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 AS215821
NetworkCountryRelationshipPathsVantage pts
AS24875NovoServe B.V.NLPeer214138
AS211826Stability for Integrated Server Hosting LtdJOPeer7676

Prefixes

The largest blocks AS215821 originates, widest first.

Largest prefixes originated by AS215821
PrefixAddressesVisibility
45.84.101.0/2425676/76
154.6.195.0/2425676/76
194.87.251.0/2425676/76
2606:f180:11::/4865.5k × /6462/63

Routing health

How AS215821'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

  • Valid75.0%3
  • Invalid0.0%0
  • No ROA25.0%1

Propagation

  • Globally propagated90% of full-feed peers or more100.0%4
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 3 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 25th Sept 2026.

No announcement by AS215821 started or stopped in this period.

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