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AS50300CustodianDC Limited

United KingdomRegistryRIPE NCCTypeContent

As of 10th November 2026, AS50300 (CustodianDC Limited), a content network registered in the United Kingdom with RIPE NCC, originates 39 IPv4 prefixes covering 10.8k addresses and 7 IPv6 prefixes. By IPv4 address space that makes it the 10,253rd-largest of the 80,723 networks we see originating IPv4, and the 314th-largest of 2,122 in the United Kingdom. It is seen behind 41 upstream networks, most often AS2914 (NTT America, Inc.) and AS3356 (Lumen (Level 3)), and in front of 6 downstream networks. 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

39

IPv6 prefixes

7

IPv4 addresses

10.8k

IPv6 /64s

22.1M

Upstream graph

The networks AS50300 is seen behind, one and two hops out, drawn from real AS paths.

AS50300Toward the internet core
Upstream graph for AS50300: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS50300CustodianDC Limit…This networkAS174Cogent Communicat…AS2914NTT America, Inc.AS3257GTT Communication…AS3356Lumen (Level 3)AS6939Hurricane Electri…AS1299Arelion (fka. Tel…AS151326DCConnect Communi…AS49544i3D.net B.VAS215859Hetzner Cloud - S…AS3549Lumen (fka. Globa…AS20130Depaul UniversityAS132337Axclusive

Networks observed one and two hops upstream of AS50300 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

1,212

adjacent networks

Upstreams
413%
Peers
1,16596%
Downstreams
60%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 41.

Upstreams of AS50300
NetworkCountryRelationshipPathsVantage pts
AS2914NTT America, Inc.USPeer98732
AS3356Lumen (Level 3)USPeer57422
AS174Cogent Communications, LLCUSPeer43513
AS6939Hurricane Electric LLCUSPeer34437
AS3257GTT Communications Inc.USPeer21538
AS9002RETN LimitedGBPeer1815
AS13030Init7 (Switzerland) Ltd.CHPeer1304
AS18106Viewqwest Pte LtdSGPeer1052
AS14537Continent 8 LLCUSPeer1032
AS25091IP-Max SACHPeer693

Prefixes

All 46

The largest blocks AS50300 originates, widest first.

Largest prefixes originated by AS50300
PrefixAddressesVisibility
185.14.164.0/221k76/76
5.102.168.0/2425676/76
5.102.169.0/2425676/76
5.102.170.0/2425676/76
5.102.171.0/2425676/76
5.102.172.0/2425676/76
5.102.173.0/2425676/76
5.102.174.0/2425676/76
5.102.175.0/2425676/76
92.118.16.0/2425676/76

Routing health

How AS50300'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

  • Valid95.7%44
  • Invalid0.0%0
  • No ROA4.3%2

Propagation

  • Globally propagated90% of full-feed peers or more100.0%46
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 39 prefixes

IPv6 — 7 prefixes

  • /4016.8M × /6414.3%1
  • /441M × /6471.4%5
  • /4865.5k × /6414.3%1

Recent changes

Announcements that started or stopped since 11th Oct 2026.

No announcement by AS50300 started or stopped in this period.

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