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AS199741TransitX Ltd

United KingdomRegistryRIPE NCC

As of 27th September 2026, AS199741 (TransitX Ltd), a network registered in the United Kingdom with RIPE NCC, originates 119 IPv4 prefixes covering 32.8k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 5,428th-largest of the 79,523 networks we see originating IPv4, and the 142nd-largest of 2,075 in the United Kingdom. It is seen behind 1 upstream network, most often AS35200 (TransitX Ltd). 94% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 94% of its routes reach at least 90% of full-feed peers, and 18 prefixes are also originated by another network.

At a glance

IPv4 prefixes

119

IPv6 prefixes

2

IPv4 addresses

32.8k

IPv6 /64s

16.8M

Upstream graph

The networks AS199741 is seen behind, one and two hops out, drawn from real AS paths.

AS199741Toward the internet core
Upstream graph for AS199741: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS199741TransitX LtdThis networkAS35200TransitX LtdAS9002RETN LimitedAS42831UK Dedicated Serv…

Networks observed one and two hops upstream of AS199741 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 AS199741
NetworkCountryRelationshipPathsVantage pts
AS35200TransitX LtdGBPeer9,374145

Prefixes

All 121

The largest blocks AS199741 originates, widest first.

Largest prefixes originated by AS199741
PrefixAddressesVisibility
94.136.168.0/221k1/81
45.11.236.0/2351281/81
45.11.238.0/2351281/81
45.155.100.0/2351276/81
96.9.214.0/2351281/81
185.75.20.0/235121/81
185.113.128.0/2351276/81
5.157.128.0/2425681/81
5.181.124.0/2425676/81
5.182.35.0/2425681/81

Routing health

How AS199741'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

  • Valid94.2%114
  • Invalid0.0%0
  • No ROA5.8%7

Propagation

  • Globally propagated90% of full-feed peers or more94.2%114
  • Partially propagated40% to 90%4.1%5
  • Seen by few peersUnder 40%1.7%2

Prefix sizes

IPv4 — 119 prefixes

IPv6 — 2 prefixes

  • /4016.8M × /6450.0%1
  • /4865.5k × /6450.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

66 announced and 0 withdrawn in all; the most recent are shown.

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