$ query “AS5400” --type=asn → 1 result(s)
AS5400 — BT
British Telecommunications PLC
AS5400 is a major transit provider operated by British Telecommunications PLC, based in the United Kingdom since 2002. The network announces a solid 697 600 IPv4 addresses, including a /16. Supports IPv6.
- 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
- March 04, 2026
- Last Seen
- March 04, 2026
Prefix Summary
- IPv4 Prefixes (raw / aggregated)
- 65 / 56
- IPv6 Prefixes (raw / aggregated)
- 14 / 6
- IPv4 Addresses
- 697 600
- Largest IPv4 Prefix
- /16 (65 536 addresses)
- Largest IPv6 Prefix
- /23
- Geolocated Countries
- 🇸🇪 SE (17 IPs), 🇬🇧 GB (53 IPs), 🇩🇪 DE (431 IPs), 🇺🇸 US, 🇳🇱 NL, 🇧🇪 BE, 🇨🇭 CH, 🇪🇸 ES, 🇨🇿 CZ, 🇮🇹 IT, 🇫🇷 FR, 🇩🇰 DK, 🇱🇺 LU, 🇮🇪 IE and 33 more
- Prefix Changed
- March 04, 2026
Reputation
- Reputation
- Pristine — 0 flagged IPs out of 697 600 total (0.00%)
Connectivity Summary
- Upstream Providers
- 3 upstream autonomous systems providing transit
- Peers
- 90 autonomous systems exchanging traffic without transit fees
- Downstream Customers
- 64 downstream autonomous systems buying transit
- Degree
- 158 unique BGP neighbors (providers + customers + peers)
- Reach
- 652 — customer cone size measuring network influence
- Degree Rank
- #905
- Reach Rank
- #675
Upstream Providers (3)
Prefix Lists
IPv4 Prefixes (65 total)
- 62.134.0.0/16 (65 536 addresses)
- 62.180.0.0/16 (65 536 addresses)
- 195.100.0.0/16 (65 536 addresses)
- 195.163.0.0/16 (65 536 addresses)
- 206.73.0.0/16 (65 536 addresses)
- 213.15.0.0/16 (65 536 addresses)
- 62.5.0.0/17 (32 768 addresses)
- 62.102.0.0/17 (32 768 addresses)
- 166.49.128.0/17 (32 768 addresses)
- 62.173.192.0/18 (16 384 addresses)
- 212.162.192.0/18 (16 384 addresses)
- 213.194.0.0/18 (16 384 addresses)
- 213.236.64.0/18 (16 384 addresses)
- 31.95.96.0/19 (8 192 addresses)
- 82.138.160.0/19 (8 192 addresses)
- 82.150.0.0/19 (8 192 addresses)
- 194.213.64.0/19 (8 192 addresses)
- 195.90.64.0/19 (8 192 addresses)
- 195.182.96.0/19 (8 192 addresses)
- 212.8.160.0/19 (8 192 addresses)
- 212.21.192.0/19 (8 192 addresses)
- 212.31.192.0/19 (8 192 addresses)
- 212.41.128.0/19 (8 192 addresses)
- 212.108.0.0/19 (8 192 addresses)
- 212.127.0.0/19 (8 192 addresses)
- 213.137.160.0/19 (8 192 addresses)
- 31.95.16.0/20 (4 096 addresses)
- 80.255.160.0/20 (4 096 addresses)
- 132.244.64.0/20 (4 096 addresses)
- 195.99.64.0/20 (4 096 addresses)
- 31.95.0.0/21 (2 048 addresses)
- 31.95.48.0/21 (2 048 addresses)
- 62.172.0.0/21 (2 048 addresses)
- 194.74.80.0/21 (2 048 addresses)
- 46.248.8.0/22 (1 024 addresses)
- 185.94.0.0/22 (1 024 addresses)
- 195.171.36.0/22 (1 024 addresses)
- 31.95.218.0/23 (512 addresses)
- 136.238.84.0/23 (512 addresses)
- 193.58.130.0/23 (512 addresses)
- 194.33.54.0/23 (512 addresses)
- 195.60.182.0/23 (512 addresses)
- 203.158.76.0/23 (512 addresses)
- 132.244.240.0/24 (256 addresses)
- 136.238.224.0/24 (256 addresses)
- 185.249.4.0/24 (256 addresses)
- 192.109.52.0/24 (256 addresses)
- 193.202.26.0/24 (256 addresses)
- 194.33.53.0/24 (256 addresses)
- 194.50.160.0/24 (256 addresses)
IPv6 Prefixes (14 total)
- 2a00:2000::/23
- 2a00:2200::/24
- 2a00:2300::/25
- 2a0c:7c80::/29
- 2a0c:8480::/30
- 2001:740::/32