Autonomous System
AS51809 BRSK Limited
ISPActiveUnited KingdomRIPE
AS51809 (BRSK) is an ISP network operated by BRSK Limited in United Kingdom, registered with RIPE. It has 39 IPv4 prefixes with 30,976 addresses and 1 IPv6 prefix, which makes it the 5,462nd largest of 82,200 active autonomous systems by IPv4 space.
IPv4 addresses30,976in 39 prefixes
IPv6 prefixes1≈ 6.3 × 10²⁹ addresses
Size rank#5,462of 82,200 active ASNs
Details
OrganizationBRSK Limited
AS nameBRSK
Websitebrsk.co.uk
Country United Kingdom (GB)
Network typeISP
RegistryRIPE
Abuse contactabuse@brsk.co.uk
Registered2021-01-15
Last updated2026-01-20
IPv4 prefixes
39 prefixes · 30,976 addresses| Network | Addresses | First – last address |
|---|---|---|
| 31.98.80.0/20 | 4,096 | 31.98.80.0 – 31.98.95.255 |
| 88.97.176.0/20 | 4,096 | 88.97.176.0 – 88.97.191.255 |
| 31.98.72.0/21 | 2,048 | 31.98.72.0 – 31.98.79.255 |
| 45.61.104.0/21 | 2,048 | 45.61.104.0 – 45.61.111.255 |
| 63.135.72.0/21 | 2,048 | 63.135.72.0 – 63.135.79.255 |
| 88.97.160.0/21 | 2,048 | 88.97.160.0 – 88.97.167.255 |
| 104.238.40.0/21 | 2,048 | 104.238.40.0 – 104.238.47.255 |
| 45.41.148.0/22 | 1,024 | 45.41.148.0 – 45.41.151.255 |
| 45.82.140.0/22 | 1,024 | 45.82.140.0 – 45.82.143.255 |
| 67.208.52.0/22 | 1,024 | 67.208.52.0 – 67.208.55.255 |
| 89.127.224.0/22 | 1,024 | 89.127.224.0 – 89.127.227.255 |
| 185.138.196.0/22 | 1,024 | 185.138.196.0 – 185.138.199.255 |
| 104.238.58.0/23 | 512 | 104.238.58.0 – 104.238.59.255 |
| 104.238.62.0/23 | 512 | 104.238.62.0 – 104.238.63.255 |
| 185.232.119.0/24 | 256 | 185.232.119.0 – 185.232.119.255 |
| 195.40.32.0/24 | 256 | 195.40.32.0 – 195.40.32.255 |
| 195.40.33.0/24 | 256 | 195.40.33.0 – 195.40.33.255 |
| 195.40.34.0/24 | 256 | 195.40.34.0 – 195.40.34.255 |
| 195.40.35.0/24 | 256 | 195.40.35.0 – 195.40.35.255 |
| 195.40.36.0/24 | 256 | 195.40.36.0 – 195.40.36.255 |
| 195.40.37.0/24 | 256 | 195.40.37.0 – 195.40.37.255 |
| 195.40.38.0/24 | 256 | 195.40.38.0 – 195.40.38.255 |
| 195.40.39.0/24 | 256 | 195.40.39.0 – 195.40.39.255 |
| 195.40.40.0/24 | 256 | 195.40.40.0 – 195.40.40.255 |
| 195.40.41.0/24 | 256 | 195.40.41.0 – 195.40.41.255 |
31.98.80.0/20 88.97.176.0/20 31.98.72.0/21 45.61.104.0/21 63.135.72.0/21 88.97.160.0/21 104.238.40.0/21 45.41.148.0/22 45.82.140.0/22 67.208.52.0/22 89.127.224.0/22 185.138.196.0/22 104.238.58.0/23 104.238.62.0/23 185.232.119.0/24 195.40.32.0/24 195.40.33.0/24 195.40.34.0/24 195.40.35.0/24 195.40.36.0/24 195.40.37.0/24 195.40.38.0/24 195.40.39.0/24 195.40.40.0/24 195.40.41.0/24
The 25 largest of 39. The API and the database have all of them.
IPv6 prefixes
1 prefix- 2a10:d580::/29
2a10:d580::/29
Query AS51809 with the API
The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day.
curl "https://api.ipapi.is/?q=AS51809&key=YOUR_API_KEY"Any address in its prefixes resolves to AS51809, with or without a key:
curl "https://api.ipapi.is/?q=31.98.80.1"