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AS209505Unchained ISP Limited

United KingdomRegistryRIPE NCCTypeEyeball

As of 11th November 2026, AS209505 (Unchained ISP Limited), an access network registered in the United Kingdom with RIPE NCC, originates 5 IPv4 prefixes covering 2k addresses and 3 IPv6 prefixes. By IPv4 address space that makes it the 25,867th-largest of the 80,763 networks we see originating IPv4, and the 770th-largest of 2,122 in the United Kingdom. It is seen behind 31 upstream networks, most often AS35200 (TransitX Ltd) and AS1299 (Arelion (fka. Telia Carrier)), and in front of 3 downstream networks. 88% of its announcements have a valid RPKI ROA; 1 is RPKI-invalid. 88% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

5

IPv6 prefixes

3

IPv4 addresses

2k

IPv6 /64s

22.5B

Upstream graph

The networks AS209505 is seen behind, one and two hops out, drawn from real AS paths.

AS209505Toward the internet core
Upstream graph for AS209505: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS209505Unchained ISP Lim…This networkAS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS6762Telecom Italia Sp…AS6939Hurricane Electri…AS35200TransitX LtdAS13030Init7 (Switzerlan…AS16552Tiggee LLCAS49544i3D.net B.VAS215859Hetzner Cloud - S…AS32590Valve CorporationAS9002RETN LimitedAS42831UK Dedicated Serv…

Networks observed one and two hops upstream of AS209505 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

138

adjacent networks

Upstreams
3122%
Peers
10475%
Downstreams
32%

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

Upstreams of AS209505
NetworkCountryRelationshipPathsVantage pts
AS35200TransitX LtdGBPeer28143
AS1299Arelion (fka. Telia Carrier)SEPeer15925
AS2914NTT America, Inc.USPeer12121
AS6762Telecom Italia Sparkle (Seabone)ITPeer4611
AS6939Hurricane Electric LLCUSPeer315
AS13030Init7 (Switzerland) Ltd.CHPeer244
AS25091IP-Max SACHPeer213
AS14537Continent 8 LLCUSPeer213
AS34549meerfarbig GmbH & Co. KGDEPeer213
AS49544i3D.net B.VNLPeer142

Prefixes

The largest blocks AS209505 originates, widest first.

Largest prefixes originated by AS209505
PrefixAddressesVisibility
185.250.8.0/221k77/77
78.41.136.0/2425677/77
89.33.9.0/2425677/77
195.10.233.0/2425677/77
212.60.144.0/242561/77
2a0b:9400::/3017.2B × /6462/63
2a0b:9404::/324.3B × /6462/63
2a13:3840:4000::/341.1B × /6462/63

Routing health

How AS209505'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

  • Valid87.5%7
  • Invalid12.5%1
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more87.5%7
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%12.5%1

Prefix sizes

IPv4 — 5 prefixes

IPv6 — 3 prefixes

  • /3017.2B × /6433.3%1
  • /324.3B × /6433.3%1
  • /341.1B × /6433.3%1

Recent changes

Announcements that started or stopped since 12th Oct 2026.

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