$ query “AS15412” --type=asn → 1 result(s)

AS15412 · FLAG-AS

Flag Telecom UK Limited

AS15412 is operated by Flag Telecom UK Limited and serves as a mid-size transit provider, based in the United Kingdom since 2002. The system announces a respectable 30 208 IPv4 addresses, and supports IPv6. Most of its address space is geolocated to the United Kingdom, with additional presence in Spain and the Philippines, and smaller footprints in 12 additional countries. Prefix announcements for this AS were recently updated.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • #72 by Reach — Top 100 by customer cone size
  • #4 in United Kingdom — Top 10 by reach within country

Basic Information

Country
🇬🇧 United Kingdom
Category
Internet Service Provider
Network Role
Mid-size Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
September 18, 2002
Last Changed
April 30, 2026
Last Seen
October 10, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
19 / 16
IPv6 Prefixes (raw / aggregated)
1 / 1
IPv4 Addresses
30 208
Largest IPv4 Prefix
/19 (8 192 addresses)
Largest IPv6 Prefix
/32
Geolocated Countries
🇬🇧 United Kingdom (10 560 IPs), 🇪🇸 Spain (5 984 IPs), 🇵🇭 Philippines (3 072 IPs) and 12 more
Prefix Changed
October 10, 2026

Reputation

Reputation
Pristine — 0 flagged IPs

Connectivity Summary

Upstream Providers
5 upstreams providing transit
Peers
357 networks exchanging traffic without transit
Downstream Customers
37 downstreams buying transit
Unclassified
15 unclassified BGP neighbors
Degree
414 unique BGP neighbors
Reach
940 networks in customer cone

Upstream Providers (5)

  • AS6939 — HURRICANE
  • AS174 — COGENT-174 (Tier-1 transit)
  • AS1299 — TWELVE99 (Tier-1 transit)
  • AS2914 — NTT-DATA-2914 (Tier-1 transit)
  • AS6762 — SEABONE-NET (Tier-1 transit)

Prefix Lists

IPv4 Prefixes (19 total)

  • 62.216.128.0/19 (8 192 addresses (/19 prefix))
  • 80.81.64.0/19 (8 192 addresses (/19 prefix))
  • 80.77.0.0/20 (4 096 addresses (/20 prefix))
  • 43.248.216.0/22 (1 024 addresses (/22 prefix))
  • 45.125.188.0/22 (1 024 addresses (/22 prefix))
  • 85.95.24.0/22 (1 024 addresses (/22 prefix))
  • 103.5.160.0/22 (1 024 addresses (/22 prefix))
  • 103.8.84.0/22 (1 024 addresses (/22 prefix))
  • 103.15.116.0/22 (1 024 addresses (/22 prefix))
  • 103.103.152.0/22 (1 024 addresses (/22 prefix))
  • 103.225.192.0/22 (1 024 addresses (/22 prefix))
  • 103.144.202.0/23 (512 addresses (/23 prefix))
  • 103.11.237.0/24 (256 addresses (/24 prefix))
  • 203.79.35.0/24 (256 addresses (/24 prefix))
  • 203.79.37.0/24 (256 addresses (/24 prefix))
  • 203.79.39.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (1 total)

  • 2001:1a00::/32