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AS51918Cerberus Networks Ltd

United KingdomRegistryRIPE NCCTypeEyeball

As of 11th November 2026, AS51918 (Cerberus Networks Ltd), an access network registered in the United Kingdom with RIPE NCC, originates 24 IPv4 prefixes covering 36.1k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 5,235th-largest of the 80,763 networks we see originating IPv4, and the 138th-largest of 2,122 in the United Kingdom. It is seen behind 26 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS174 (Cogent Communications, LLC). 96% 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

24

IPv6 prefixes

2

IPv4 addresses

36.1k

IPv6 /64s

38.7B

Upstream graph

The networks AS51918 is seen behind, one and two hops out, drawn from real AS paths.

AS51918Toward the internet core
Upstream graph for AS51918: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS51918Cerberus Networks…This networkAS174Cogent Communicat…AS3170VeloxServ Communi…AS6939Hurricane Electri…AS13030Init7 (Switzerlan…AS24482SG.GSAS151326DCConnect Communi…AS1299Arelion (fka. Tel…AS20130Depaul UniversityAS132337AxclusiveAS56662Marcin GondekAS38623Metfone (Viettel …AS215859Hetzner Cloud - S…

Networks observed one and two hops upstream of AS51918 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

99

adjacent networks

Upstreams
2626%
Peers
7374%
Downstreams
00%

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

Upstreams of AS51918
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer1,13990
AS174Cogent Communications, LLCUSPeer31218
AS13030Init7 (Switzerland) Ltd.CHPeer524
AS24482SG.GSSGPeer273
AS39122Blacknight Internet Solutions LimitedIEPeer262
AS58511Swoop (Anycast Global Backbone)AUPeer262
AS4775Globe TelecomsPHAdjacent262
AS7195EdgeUnoCOPeer262
AS32590Valve CorporationUSPeer262
AS49544i3D.net B.VNLPeer262

Prefixes

All 26

The largest blocks AS51918 originates, widest first.

Largest prefixes originated by AS51918
PrefixAddressesVisibility
46.37.32.0/198.2k77/77
83.151.224.0/198.2k77/77
46.37.32.0/221k77/77
46.37.36.0/221k77/77
46.37.40.0/221k77/77
46.37.44.0/221k77/77
46.37.48.0/221k77/77
46.37.52.0/221k77/77
46.37.56.0/221k77/77
46.37.60.0/221k77/77

Routing health

How AS51918'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
  • Invalid0.0%0
  • No ROA3.8%1

Propagation

  • Globally propagated90% of full-feed peers or more100.0%26
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 24 prefixes

IPv6 — 2 prefixes

  • /2934.4B × /6450.0%1
  • /324.3B × /6450.0%1

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS51918 started or stopped in this period.

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