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AS15412Flag Telecom UK Limited

United KingdomRegistryRIPE NCCTypeCarrier

As of 10th November 2026, AS15412 (Flag Telecom UK Limited), a transit carrier registered in the United Kingdom with RIPE NCC, originates 21 IPv4 prefixes covering 34.8k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 5,328th-largest of the 80,723 networks we see originating IPv4, and the 144th-largest of 2,122 in the United Kingdom. It is seen behind 48 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS1299 (Arelion (fka. Telia Carrier)), and in front of 148 downstream networks. 73% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 91% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

21

IPv6 prefixes

1

IPv4 addresses

34.8k

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: 11 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…AS2497Internet Initiati…AS2914NTT America, Inc.AS6939Hurricane Electri…AS13030Init7 (Switzerlan…AS16552Tiggee LLCAS49544i3D.net B.VAS215859Hetzner Cloud - S…AS20130Depaul UniversityAS132337AxclusiveAS56662Marcin Gondek

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

701

adjacent networks

Upstreams
487%
Peers
50572%
Downstreams
14821%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 48.

Upstreams of AS15412
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer122,17289
AS1299Arelion (fka. Telia Carrier)SEPeer21,77170
AS2914NTT America, Inc.USPeer20,30664
AS13030Init7 (Switzerland) Ltd.CHPeer11,4485
AS2497Internet Initiative Japan Inc.JPPeer10,0516
AS18106Viewqwest Pte LtdSGPeer8,1314
AS3491PCCW Global (HK) Ltd.HKPeer7,6428
AS5413Wavenet LimitedGBPeer7,0891
AS6667Elisa OyjFIPeer6,6222
AS49544i3D.net B.VNLPeer6,5534

Prefixes

The largest blocks AS15412 originates, widest first.

Largest prefixes originated by AS15412
PrefixAddressesVisibility
62.216.128.0/198.2k76/76
80.81.64.0/198.2k76/76
80.77.0.0/204.1k76/76
203.79.32.0/204.1k47/76
43.248.216.0/221k76/76
45.125.188.0/221k76/76
85.95.24.0/221k76/76
103.5.160.0/221k76/76
103.15.116.0/221k76/76
103.103.152.0/221k76/76

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

  • Valid72.7%16
  • Invalid0.0%0
  • No ROA27.3%6

Propagation

  • Globally propagated90% of full-feed peers or more90.9%20
  • Partially propagated40% to 90%4.5%1
  • Seen by few peersUnder 40%4.5%1

Prefix sizes

IPv4 — 21 prefixes

IPv6 — 1 prefixes

  • /324.3B × /64100.0%1

Recent changes

Announcements that started or stopped since 11th Oct 2026.

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