subnet.im

AS219412Lewis Brown

United KingdomRegistryRIPE NCCTypeEyeball

As of 26th September 2026, AS219412 (Lewis Brown), an access network registered in the United Kingdom with RIPE NCC, originates 1 IPv4 prefix covering 256 addresses and 13 IPv6 prefixes. By IPv4 address space that makes it the 59,122nd-largest of the 79,516 networks we see originating IPv4, and the 1,593rd-largest of 2,074 in the United Kingdom. It is seen behind 3 upstream networks, most often AS20473 (The Constant Company, LLC) and AS214205 (Cristian Tudor Marcus), and in front of 1 downstream network. 93% 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

1

IPv6 prefixes

13

IPv4 addresses

256

IPv6 /64s

4.9B

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: 8 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS219412Lewis BrownThis networkAS20473The Constant Comp…AS47272HYEHOST LLCAS214205Cristian Tudor Ma…AS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS204208Peravix Group LTDAS6939Hurricane Electri…AS215638Cilix Limited

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

17

adjacent networks

Upstreams
318%
Peers
1376%
Downstreams
16%

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

Upstreams of AS219412
NetworkCountryRelationshipPathsVantage pts
AS20473The Constant Company, LLCUSPeer437144
AS214205Cristian Tudor MarcusROPeer37863
AS47272HYEHOST LLCUSPeer28333

Prefixes

The largest blocks AS219412 originates, widest first.

Largest prefixes originated by AS219412
PrefixAddressesVisibility
185.121.178.0/2425681/81
2a0d:d904::/324.3B × /6463/64
2a0f:6280:c000::/36268M × /6464/64
2a14:7584:e000::/36268M × /6464/64
2a05:dfc3:f900::/4016.8M × /6464/64
2a14:7581:3b00::/4016.8M × /6464/64
2a12:bec4:12a0::/441M × /6464/64
2a14:7581:9f60::/441M × /6464/64
2a14:c380:28::/47131k × /6464/64
2602:f96d:101::/4865.5k × /6464/64

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

  • Valid92.9%13
  • Invalid0.0%0
  • No ROA7.1%1

Propagation

  • Globally propagated90% of full-feed peers or more100.0%14
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 1 prefixes

IPv6 — 13 prefixes

  • /324.3B × /647.7%1
  • /36268M × /6415.4%2
  • /4016.8M × /6415.4%2
  • /441M × /6415.4%2
  • /47131k × /647.7%1
  • /4865.5k × /6438.5%5

Recent changes

Announcements that started or stopped since 28th Aug 2026.

  • Announced2a12:bec4:12a0::/4425th Sept 2026
  • Announced2a14:7581:9f60::/4425th Sept 2026
  • Withdrawn2a0d:d904:3::/4824th Sept 2026
  • Withdrawn2a0d:d904::/4824th Sept 2026
  • Withdrawn2a0d:d904:c000::/4024th Sept 2026
  • Withdrawn2a12:bec4:12a0::/4724th Sept 2026
  • Withdrawn2a12:bec4:12a4::/4624th Sept 2026
  • Withdrawn2a12:bec4:12a8::/4524th Sept 2026
  • Withdrawn2a12:bec4:12ab::/4824th Sept 2026
  • Withdrawn2a14:7581:9f60::/4524th Sept 2026
  • Withdrawn2a14:7581:9f68::/4624th Sept 2026
  • Withdrawn2a14:7581:9f6c::/4724th Sept 2026

12 announced and 63 withdrawn in all; the most recent are shown.

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