subnet.im

AS39545Fluidone Ltd.

United KingdomRegistryRIPE NCC

As of 11th November 2026, AS39545 (Fluidone Ltd.), a network registered in the United Kingdom with RIPE NCC, originates 6 IPv4 prefixes covering 37.6k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 5,119th-largest of the 80,747 networks we see originating IPv4, and the 129th-largest of 2,122 in the United Kingdom. It is seen behind 8 upstream networks, most often AS4455 (IX Reach Ltd) and AS3257 (GTT Communications Inc.), and in front of 7 downstream networks. Every one of its announcements has 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

6

IPv6 prefixes

1

IPv4 addresses

37.6k

IPv6 /64s

4.3B

Upstream graph

The networks AS39545 is seen behind, one and two hops out, drawn from real AS paths.

AS39545Toward the internet core
Upstream graph for AS39545: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS39545Fluidone Ltd.This networkAS3257GTT Communication…AS4455IX Reach LtdAS6939Hurricane Electri…AS31216BSO Network Solut…AS39326Syntura Group Lim…AS6667Elisa OyjAS398465Rackdog LLCAS5511Orange S.A.AS1299Arelion (fka. Tel…AS3356Lumen (Level 3)AS6453TATA Communicatio…AS2914NTT America, Inc.

Networks observed one and two hops upstream of AS39545 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

38

adjacent networks

Upstreams
821%
Peers
2361%
Downstreams
718%

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

Upstreams of AS39545
NetworkCountryRelationshipPathsVantage pts
AS4455IX Reach LtdGBPeer1,06058
AS3257GTT Communications Inc.USPeer1,03076
AS39326Syntura Group LimitedGBPeer54137
AS31216BSO Network Solutions SASFRPeer23515
AS6939Hurricane Electric LLCUSPeer15712
AS13030Init7 (Switzerland) Ltd.CHPeer772
AS37100SEACOM LimitedMUPeer451
AS43531BSO Network Solutions SASFRPeer422

Prefixes

The largest blocks AS39545 originates, widest first.

Largest prefixes originated by AS39545
PrefixAddressesVisibility
77.89.128.0/1816.4k76/76
46.247.0.0/198.2k76/76
89.105.96.0/198.2k76/76
46.247.112.0/204.1k76/76
46.247.110.0/2351276/76
77.89.145.0/2425676/76
2a00:f18::/324.3B × /6461/63

Routing health

How AS39545'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

  • Valid100.0%7
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%7
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 6 prefixes

IPv6 — 1 prefixes

  • /324.3B × /64100.0%1

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS39545 started or stopped in this period.

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