subnet.im

AS219412Lewis Brown

United KingdomRegistryRIPE NCCTypeEyeball

As of 11th November 2026, AS219412 (Lewis Brown), an access network registered in the United Kingdom with RIPE NCC, originates 1 IPv4 prefix covering 256 addresses and 25 IPv6 prefixes. By IPv4 address space that makes it the 59,962nd-largest of the 80,733 networks we see originating IPv4, and the 1,620th-largest of 2,122 in the United Kingdom. It is seen behind 6 upstream networks, most often AS20473 (The Constant Company, LLC) and AS47272 (HYEHOST LLC), and in front of 1 downstream network. 96% of its announcements have a valid RPKI ROA; 1 is RPKI-invalid. 92% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

1

IPv6 prefixes

25

IPv4 addresses

256

IPv6 /64s

4.6B

Upstream graph

The networks AS219412 is seen behind, one and two hops out, drawn from real AS paths.

AS219412Toward the internet core
Upstream graph for AS219412: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS219412Lewis BrownThis networkAS20473The Constant Comp…AS37989DCS1AS47272HYEHOST LLCAS212895Johannes ErnstAS218995Bobeica Mihaita D…AS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS6939Hurricane Electri…AS204208Peravix Group LTDAS52025ParadoxNetworks L…AS205941Lungu Stefan Gabr…AS215114Stevan Durand--L'…

Networks observed one and two hops upstream of AS219412 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

22

adjacent networks

Upstreams
627%
Peers
1568%
Downstreams
15%

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

Upstreams of AS219412
NetworkCountryRelationshipPathsVantage pts
AS20473The Constant Company, LLCUSPeer826131
AS47272HYEHOST LLCUSPeer51163
AS212895Johannes ErnstDEPeer12663
AS218995Bobeica Mihaita DavidROPeer9962
AS37989DCS1SGPeer88
AS214205Cristian Tudor MarcusROPeer11

Prefixes

All 26

The largest blocks AS219412 originates, widest first.

Largest prefixes originated by AS219412
PrefixAddressesVisibility
185.121.178.0/2425676/76
2a0d:d904::/324.3B × /6463/63
2a14:7584:e000::/36268M × /6420/63
2a05:dfc3:f900::/4016.8M × /6462/63
2a14:7581:3b00::/4016.8M × /6462/63
2a09:3f00:3c30::/441M × /6462/63
2a09:3f00:3c40::/441M × /6462/63
2a09:3f00:3c50::/441M × /6462/63
2a09:3f00:3c60::/441M × /6462/63
2a12:bec4:12a0::/441M × /6462/63

Routing health

How AS219412'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

  • Valid96.2%25
  • Invalid3.8%1
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more92.3%24
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%7.7%2

Prefix sizes

IPv4 — 1 prefixes

IPv6 — 25 prefixes

  • /324.3B × /644.0%1
  • /36268M × /644.0%1
  • /4016.8M × /648.0%2
  • /441M × /6424.0%6
  • /47131k × /644.0%1
  • /4865.5k × /6456.0%14

Recent changes

Announcements that started or stopped since 12th Oct 2026.

21 announced and 12 withdrawn in all; the most recent are shown.

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