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AS203898Cloudflare London Office

United StatesRegistryRIPE NCC

As of 10th November 2026, AS203898 (Cloudflare London Office), a network registered in the United States with RIPE NCC, originates 1 IPv4 prefix covering 256 addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 59,958th-largest of the 80,723 networks we see originating IPv4, and the 13,081st-largest of 18,750 in the United States. It is seen behind 3 upstream networks, most often AS8220 (COLT) and AS2860 (NOS COMUNICACOES, S.A.). 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

1

IPv6 prefixes

2

IPv4 addresses

256

IPv6 /64s

131k

Upstream graph

The networks AS203898 is seen behind, one and two hops out, drawn from real AS paths.

AS203898Toward the internet core
Upstream graph for AS203898: 8 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS203898Cloudflare London…This networkAS1273Vodafone Group PLCAS2860NOS COMUNICACOES,…AS8220COLTAS6667Elisa OyjAS41811CONVERGENCE (GROU…AS6453TATA Communicatio…AS3356Lumen (Level 3)AS1299Arelion (fka. Tel…

Networks observed one and two hops upstream of AS203898 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

6

adjacent networks

Upstreams
350%
Peers
350%
Downstreams
00%

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

Upstreams of AS203898
NetworkCountryRelationshipPathsVantage pts
AS8220COLTGBPeer131131
AS2860NOS COMUNICACOES, S.A.PTPeer6060
AS1273Vodafone Group PLCEUPeer77

Prefixes

The largest blocks AS203898 originates, widest first.

Largest prefixes originated by AS203898
PrefixAddressesVisibility
185.122.0.0/2425676/76
2606:54c1:a::/4865.5k × /6462/63
2606:54c1:c::/4865.5k × /6460/63

Routing health

How AS203898'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%3
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%3
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 1 prefixes

IPv6 — 2 prefixes

  • /4865.5k × /64100.0%2

Recent changes

Announcements that started or stopped since 11th Oct 2026.

No announcement by AS203898 started or stopped in this period.

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