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AS212194YUUSEI LTD

United KingdomRegistryRIPE NCC

As of 12th November 2026, AS212194 (YUUSEI LTD), a network registered in the United Kingdom with RIPE NCC, originates 9 IPv4 prefixes covering 5.4k addresses and 3 IPv6 prefixes. By IPv4 address space that makes it the 15,303rd-largest of the 80,772 networks we see originating IPv4, and the 460th-largest of 2,122 in the United Kingdom. It is seen behind 2 upstream networks, most often AS17433 (Hytron Network Services Limited) and AS8796 (FASTNET DATA INC). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 83% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

9

IPv6 prefixes

3

IPv4 addresses

5.4k

IPv6 /64s

197k

Upstream graph

The networks AS212194 is seen behind, one and two hops out, drawn from real AS paths.

AS212194Toward the internet core
Upstream graph for AS212194: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS212194YUUSEI LTDThis networkAS8796FASTNET DATA INCAS17433Hytron Network Se…AS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS3356Lumen (Level 3)AS3491PCCW Global (HK) …

Networks observed one and two hops upstream of AS212194 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 AS212194
NetworkCountryRelationshipPathsVantage pts
AS17433Hytron Network Services LimitedHKPeer633140
AS8796FASTNET DATA INCUSPeer15778

Prefixes

The largest blocks AS212194 originates, widest first.

Largest prefixes originated by AS212194
PrefixAddressesVisibility
2.26.200.0/212k78/78
2.26.200.0/2351278/78
2.26.202.0/2351278/78
2.26.204.0/2351278/78
2.27.146.0/2351278/78
2.27.212.0/2351278/78
2.27.212.0/242561/78
151.242.65.0/2425678/78
169.40.128.0/2425657/78
2a14:67c4:11::/4865.5k × /6462/64

Routing health

How AS212194'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%12
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more83.3%10
  • Partially propagated40% to 90%8.3%1
  • Seen by few peersUnder 40%8.3%1

Prefix sizes

IPv4 — 9 prefixes

IPv6 — 3 prefixes

  • /4865.5k × /64100.0%3

Recent changes

Announcements that started or stopped since 13th Oct 2026.

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