subnet.im

AS51601IPTP LTD

United KingdomRegistryRIPE NCC

As of 27th September 2026, AS51601 (IPTP LTD), a network registered in the United Kingdom with RIPE NCC, originates 3 IPv4 prefixes covering 1.8k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 29,817th-largest of the 79,525 networks we see originating IPv4, and the 851st-largest of 2,074 in the United Kingdom. It is seen behind 6 upstream networks, most often AS41095 (IPTP LTD) and AS6939 (Hurricane Electric LLC), and in front of 9 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 60% of its routes reach at least 90% of full-feed peers, and 2 prefixes are also originated by another network.

At a glance

IPv4 prefixes

3

IPv6 prefixes

2

IPv4 addresses

1.8k

IPv6 /64s

269M

Upstream graph

The networks AS51601 is seen behind, one and two hops out, drawn from real AS paths.

AS51601Toward the internet core
Upstream graph for AS51601: 11 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS51601IPTP LTDThis networkAS6939Hurricane Electri…AS32590Valve CorporationAS41095IPTP LTDAS50509Transroute.NetAS200612Gulf Bridge Inter…AS18106Viewqwest Pte LtdAS20130Depaul UniversityAS1299Arelion (fka. Tel…AS3356Lumen (Level 3)AS174Cogent Communicat…AS3257GTT Communication…

Networks observed one and two hops upstream of AS51601 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

73

adjacent networks

Upstreams
68%
Peers
5879%
Downstreams
912%

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

Upstreams of AS51601
NetworkCountryRelationshipPathsVantage pts
AS41095IPTP LTDGBPeer2,261122
AS6939Hurricane Electric LLCUSPeer11421
AS32590Valve CorporationUSPeer672
AS200612Gulf Bridge International Inc.VGPeer5336
AS50509Transroute.NetRUPeer514
AS25091IP-Max SACHPeer365

Prefixes

The largest blocks AS51601 originates, widest first.

Largest prefixes originated by AS51601
PrefixAddressesVisibility
195.189.120.0/221k81/81
176.56.170.0/2351217/81
185.65.175.0/2425636/81
2a03:9d40:6000::/36268M × /6463/64
2a03:9d40:6000::/4865.5k × /6463/64

Routing health

How AS51601'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%5
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more60.0%3
  • Partially propagated40% to 90%20.0%1
  • Seen by few peersUnder 40%20.0%1

Prefix sizes

IPv4 — 3 prefixes

IPv6 — 2 prefixes

  • /36268M × /6450.0%1
  • /4865.5k × /6450.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS51601 started or stopped in this period.

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