$ query “AS5400” --type=asn → 1 result(s)

AS5400 · BT

British Telecommunications Limited

AS5400 is operated by British Telecommunications Limited and serves as a major transit provider, established in the United Kingdom in 2002. The system announces a solid 709 632 IPv4 addresses, including a /16, and supports IPv6. The bulk of its IP address space is in Sweden, with additional presence in the United Kingdom and Germany, and smaller footprints in 44 additional countries.

  • Top 5% — Top 5% of all autonomous systems by reach and degree

Basic Information

Country
🇬🇧 United Kingdom
Category
Internet Service Provider
Network Role
Major Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
August 29, 2002
Last Changed
June 30, 2026
Last Seen
July 25, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
81 / 66
IPv6 Prefixes (raw / aggregated)
36 / 13
IPv4 Addresses
709 632
Largest IPv4 Prefix
/16 (65 536 addresses)
Largest IPv6 Prefix
/23
Geolocated Countries
🇸🇪 Sweden (405 712 IPs), 🇬🇧 United Kingdom (269 696 IPs), 🇩🇪 Germany (156 240 IPs) and 44 more
Prefix Changed
July 11, 2026

Reputation

Reputation
Pristine — 0 flagged IPs

Connectivity Summary

Upstream Providers
4 upstreams providing transit
Peers
93 networks exchanging traffic without transit
Downstream Customers
62 downstreams buying transit
Unclassified
2 unclassified BGP neighbors
Degree
161 unique BGP neighbors
Reach
319 networks in customer cone

Upstream Providers (4)

  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS1299 — TWELVE99 (Tier-1 transit)
  • AS2914 — NTT-DATA-2914 (Tier-1 transit)
  • AS4637 — ASN-TELSTRA-GLOBAL

Prefix Lists

IPv4 Prefixes (81 total)

  • 62.180.0.0/16 (65 536 addresses (/16 prefix))
  • 213.15.0.0/16 (65 536 addresses (/16 prefix))
  • 195.100.0.0/16 (65 536 addresses (/16 prefix))
  • 195.163.0.0/16 (65 536 addresses (/16 prefix))
  • 62.134.0.0/16 (65 536 addresses (/16 prefix))
  • 206.73.0.0/16 (65 536 addresses (/16 prefix))
  • 166.49.128.0/17 (32 768 addresses (/17 prefix))
  • 62.5.0.0/17 (32 768 addresses (/17 prefix))
  • 62.102.0.0/17 (32 768 addresses (/17 prefix))
  • 212.162.192.0/18 (16 384 addresses (/18 prefix))
  • 62.173.192.0/18 (16 384 addresses (/18 prefix))
  • 213.194.0.0/18 (16 384 addresses (/18 prefix))
  • 213.236.64.0/18 (16 384 addresses (/18 prefix))
  • 212.21.192.0/19 (8 192 addresses (/19 prefix))
  • 31.95.96.0/19 (8 192 addresses (/19 prefix))
  • 194.213.64.0/19 (8 192 addresses (/19 prefix))
  • 195.182.96.0/19 (8 192 addresses (/19 prefix))
  • 213.137.160.0/19 (8 192 addresses (/19 prefix))
  • 212.8.160.0/19 (8 192 addresses (/19 prefix))
  • 195.90.64.0/19 (8 192 addresses (/19 prefix))
  • 82.138.160.0/19 (8 192 addresses (/19 prefix))
  • 82.150.0.0/19 (8 192 addresses (/19 prefix))
  • 212.31.192.0/19 (8 192 addresses (/19 prefix))
  • 212.41.128.0/19 (8 192 addresses (/19 prefix))
  • 212.127.0.0/19 (8 192 addresses (/19 prefix))
  • 212.108.0.0/19 (8 192 addresses (/19 prefix))
  • 31.95.160.0/20 (4 096 addresses (/20 prefix))
  • 195.99.64.0/20 (4 096 addresses (/20 prefix))
  • 31.95.16.0/20 (4 096 addresses (/20 prefix))
  • 132.244.64.0/20 (4 096 addresses (/20 prefix))
  • 80.255.160.0/20 (4 096 addresses (/20 prefix))
  • 194.74.80.0/21 (2 048 addresses (/21 prefix))
  • 31.95.0.0/21 (2 048 addresses (/21 prefix))
  • 62.172.0.0/21 (2 048 addresses (/21 prefix))
  • 31.95.208.0/21 (2 048 addresses (/21 prefix))
  • 31.95.48.0/21 (2 048 addresses (/21 prefix))
  • 31.95.184.0/21 (2 048 addresses (/21 prefix))
  • 46.248.8.0/22 (1 024 addresses (/22 prefix))
  • 195.171.36.0/22 (1 024 addresses (/22 prefix))
  • 31.95.220.0/22 (1 024 addresses (/22 prefix))
  • 185.94.0.0/22 (1 024 addresses (/22 prefix))
  • 203.158.68.0/23 (512 addresses (/23 prefix))
  • 203.158.88.0/23 (512 addresses (/23 prefix))
  • 195.60.182.0/23 (512 addresses (/23 prefix))
  • 31.95.14.0/23 (512 addresses (/23 prefix))
  • 31.95.218.0/23 (512 addresses (/23 prefix))
  • 31.95.246.0/23 (512 addresses (/23 prefix))
  • 136.238.84.0/23 (512 addresses (/23 prefix))
  • 193.58.130.0/23 (512 addresses (/23 prefix))
  • 194.33.54.0/23 (512 addresses (/23 prefix))

IPv6 Prefixes (36 total)

  • 2a00:2000::/23
  • 2a00:2200::/24
  • 2a00:2300::/25
  • 2a0c:7c80::/29
  • 2001:740::/32
  • 2606:f100:d800::/37
  • 2606:f100:d400::/38
  • 2402:fb00:c000::/38
  • 2606:f100:d000::/39
  • 2606:f100:e400::/39
  • 2402:fb00:8400::/39
  • 2402:fb00:8000::/39
  • 2402:fb00:8800::/40