subnet.im

AS15412Flag Telecom UK Limited

United KingdomRegistryRIPE NCCTypeCarrier

As of 26th September 2026, AS15412 (Flag Telecom UK Limited), a transit carrier registered in the United Kingdom with RIPE NCC, originates 20 IPv4 prefixes covering 34.3k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 5,293rd-largest of the 79,480 networks we see originating IPv4, and the 136th-largest of 2,074 in the United Kingdom. It is seen behind 47 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS2914 (NTT America, Inc.), and in front of 140 downstream networks. 76% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 95% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

20

IPv6 prefixes

1

IPv4 addresses

34.3k

IPv6 /64s

4.3B

Upstream graph

The networks AS15412 is seen behind, one and two hops out, drawn from real AS paths.

AS15412Toward the internet core
Upstream graph for AS15412: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS15412Flag Telecom UK L…This networkAS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS3491PCCW Global (HK) …AS6939Hurricane Electri…AS18106Viewqwest Pte LtdAS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS3130RGnet OUAS49544i3D.net B.VAS24516Virtutel Pty LtdAS58511Swoop (Anycast Gl…AS20130Depaul University

Networks observed one and two hops upstream of AS15412 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

668

adjacent networks

Upstreams
477%
Peers
48172%
Downstreams
14021%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 47.

Upstreams of AS15412
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer123,392101
AS2914NTT America, Inc.USPeer27,06767
AS1299Arelion (fka. Telia Carrier)SEPeer22,29275
AS3491PCCW Global (HK) Ltd.HKPeer10,0008
AS18106Viewqwest Pte LtdSGPeer8,9863
AS6667Elisa OyjFIPeer8,5722
AS2497Internet Initiative Japan Inc.JPPeer8,0676
AS5413Wavenet LimitedGBPeer7,5291
AS49544i3D.net B.VNLPeer6,0084
AS6453TATA Communications (America) IncUSPeer5,72524

Prefixes

The largest blocks AS15412 originates, widest first.

Largest prefixes originated by AS15412
PrefixAddressesVisibility
62.216.128.0/198.2k81/81
80.81.64.0/198.2k81/81
80.77.0.0/204.1k81/81
203.79.32.0/204.1k46/81
43.248.216.0/221k81/81
45.125.188.0/221k81/81
85.95.24.0/221k81/81
103.5.160.0/221k81/81
103.15.116.0/221k81/81
103.103.152.0/221k81/81

Routing health

How AS15412'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

  • Valid76.2%16
  • Invalid0.0%0
  • No ROA23.8%5

Propagation

  • Globally propagated90% of full-feed peers or more95.2%20
  • Partially propagated40% to 90%4.8%1
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 20 prefixes

IPv6 — 1 prefixes

  • /324.3B × /64100.0%1

Recent changes

Announcements that started or stopped since 27th Aug 2026.

  • Withdrawn103.154.20.0/2322nd Sept 2026

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