AS5400
British Telecommunications Limited
Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Isp allocation +5
- Trust score 70 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Network profile
Source: PeeringDB →Present at 56 internet exchanges: BNIX, Equinix Chicago, LINX LON1: Main, DE-CIX Frankfurt: DE-CIX Frankfurt Peering LAN, Equinix San Jose, LINX LON2, ESpanix Madrid Lower LAN, Equinix Paris: Equinix IX - PA Metro, Equinix Ashburn, NIX.CZ: Public peering VLAN, …
AS5400 — global IP footprint
Cities where AS5400 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.
Top CIDR ranges
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS5400 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 203.158.72.0/23 | 14,550 | 2026-08-26 16:55:41 |
| 192.109.52.0/24 | 14,059 | 2026-08-26 16:54:51 |
| 203.158.68.0/23 | 13,495 | 2026-08-26 17:12:02 |
| 203.158.76.0/23 | 13,190 | 2026-08-26 16:55:41 |
| 82.138.160.0/19 | 9,941 | 2026-08-26 16:54:51 |
| 206.73.48.0/20 | 9,777 | 2026-08-26 16:54:51 |
| 132.244.240.0/24 | 9,275 | 2026-08-26 16:54:51 |
| 132.244.64.0/21 | 9,185 | 2026-08-26 16:54:51 |
| 132.244.72.0/21 | 8,845 | 2026-08-26 16:54:51 |
| 62.172.0.0/21 | 8,774 | 2026-08-26 16:54:51 |
| 212.21.192.0/19 | 8,438 | 2026-08-26 16:54:51 |
| 193.202.26.0/24 | 8,139 | 2026-08-12 08:06:38 |
| 194.107.114.0/24 | 7,846 | 2026-08-26 16:54:51 |
| 136.238.224.0/24 | 7,806 | 2026-08-26 16:54:51 |
| 194.213.64.0/19 | 7,774 | 2026-08-26 16:54:51 |
| 206.73.116.0/22 | 7,630 | 2026-08-26 17:15:50 |
| 206.73.80.0/20 | 7,537 | 2026-08-26 17:15:38 |
| 213.137.160.0/19 | 7,509 | 2026-08-26 16:54:51 |
| 195.163.0.0/16 | 7,434 | 2026-08-26 16:54:51 |
| 82.150.0.0/19 | 7,419 | 2026-08-26 16:54:51 |
| 212.31.192.0/19 | 7,391 | 2026-08-26 16:54:51 |
| 62.5.0.0/17 | 7,385 | 2026-08-26 17:15:46 |
| 31.95.220.0/22 | 7,360 | 2026-08-26 16:54:52 |
| 31.95.184.0/21 | 7,331 | 2026-08-26 16:54:52 |
| 194.33.55.0/24 | 7,314 | 2026-08-26 16:54:51 |
| 213.194.0.0/18 | 7,285 | 2026-08-26 16:54:51 |
| 62.173.192.0/18 | 7,274 | 2026-08-26 16:54:51 |
| 31.95.96.0/19 | 7,247 | 2026-08-26 16:54:52 |
| 31.95.16.0/20 | 7,237 | 2026-08-26 16:54:52 |
| 31.95.56.0/24 | 7,228 | 2026-08-26 16:54:52 |
| 212.108.0.0/19 | 7,185 | 2026-08-26 16:54:51 |
| 194.33.54.0/24 | 7,175 | 2026-08-26 16:54:51 |
| 206.73.0.0/19 | 7,174 | 2026-08-26 16:54:51 |
| 206.73.112.0/22 | 7,149 | 2026-08-26 16:54:51 |
| 195.99.64.0/20 | 7,135 | 2026-08-26 16:54:51 |
| 194.33.53.0/24 | 7,126 | 2026-08-26 16:54:51 |
| 213.236.64.0/18 | 7,107 | 2026-08-26 16:54:51 |
| 213.15.0.0/16 | 7,075 | 2026-08-26 16:54:51 |
| 206.73.156.0/22 | 7,047 | 2026-08-26 17:02:20 |
| 212.8.160.0/19 | 7,042 | 2026-08-26 16:54:51 |
| 195.36.82.0/24 | 7,035 | 2026-08-26 16:54:51 |
| 31.95.218.0/23 | 7,033 | 2026-08-26 16:54:52 |
| 31.95.160.0/20 | 7,026 | 2026-08-26 16:54:52 |
| 195.60.182.0/24 | 6,992 | 2026-08-26 16:54:51 |
| 31.95.14.0/23 | 6,987 | 2026-08-26 16:54:52 |
| 195.182.96.0/19 | 6,985 | 2026-08-26 16:54:51 |
| 31.95.0.0/21 | 6,878 | 2026-08-26 16:54:52 |
| 212.127.0.0/19 | 6,874 | 2026-08-26 16:54:51 |
| 195.60.183.0/24 | 6,871 | 2026-08-26 16:54:51 |
| 198.178.236.0/24 | 6,863 | 2026-08-26 16:54:51 |
Showing top 50 of 87 announced prefixes by sample volume.
Frequently Asked Questions
What is AS5400?
AS5400 is an Autonomous System Number assigned to British Telecommunications Limited. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS5400 announce?
AS5400 announces 713.7K IPv4 addresses distributed across 73 routed CIDR prefixes. The network is registered in United Kingdom.
Who operates AS5400?
AS5400 is operated by British Telecommunications Limited. The organization is based in United Kingdom. You can view all IP ranges and related ASNs on the organization page.
What country is AS5400 registered in?
AS5400 is registered in United Kingdom. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
