AS51809 BRSK Limited
IPv4 addresses
30,976
IPv6 /48 networks
524,288
RPKI
33 valid7 no ROA
Peers and downstreams
1
Holder
- AS name
- BRSK
- Description
- BRSK Limited
- Organisation
- BRSK Limited
- Registered in
- London, United Kingdom
- Abuse contact
- abuse@brsk.co.uk
- Assigned
- 2021-01-14
- Registered
- 2021-01-15
- Record last changed
- 2026-01-20 14:59 UTC
104.238.40.0/21104.238.58.0/23104.238.62.0/23185.138.196.0/22185.232.119.0/24195.40.32.0/24195.40.33.0/24195.40.34.0/24195.40.35.0/24195.40.36.0/24195.40.37.0/24195.40.38.0/24195.40.39.0/24195.40.40.0/24195.40.41.0/24195.40.42.0/24195.40.43.0/24195.40.44.0/24195.40.45.0/24195.40.46.0/24195.40.47.0/24195.40.48.0/24195.40.49.0/24195.40.50.0/24195.40.51.0/24195.40.52.0/24195.40.53.0/24195.40.54.0/24195.40.55.0/2431.98.72.0/2131.98.80.0/2045.41.148.0/2245.61.104.0/2145.82.140.0/2263.135.72.0/2167.208.52.0/2288.97.160.0/2188.97.176.0/2089.127.224.0/22
| AS212655 | YouFibre Limited youfibre |
| AS216405 | Metric Systems UK LTD MSUK-ISP |
None seen.
Upstream graph
Upstreams and their upstreams, from BGP pathsNetwork health
Grade A · 91/100| partly | Prefixes covered by valid ROAs 33 of 40 announced prefixes are RPKI valid, 7 have no ROA. |
21/25 |
| pass | No RPKI invalid announcements None of the announcements is RPKI invalid. |
10/10 |
| pass | Announces IPv6 1 IPv6 prefix. |
15/15 |
| partly | More than one upstream 1 upstream seen in BGP. |
5/10 |
| pass | Working abuse contact abuse@brsk.co.uk is published. |
15/15 |
| pass | Publishes a geofeed A geofeed (RFC 8805) tells where the address space is used. |
10/10 |
| pass | No prefixes smaller than /24 or /48 All prefixes are /24 (IPv4) or /48 (IPv6) or larger. |
10/10 |
| pass | Registry record maintained Last changed 2026-01-20. |
5/5 |
Built from the announced prefixes, RPKI, the registry record and geofeeds. Checks without data are not counted. Also in the API.
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Markdown
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Routing changes
Last 30 days| 2026-10-04 14:26 UTC | New prefix | 89.127.224.0/22 |
WHOIS
aut-num: AS51809 as-name: BRSK org: ORG-BL479-RIPE admin-c: BRSK-RIPE admin-c: JODY-RIPE tech-c: BRSK-RIPE tech-c: JODY-RIPE status: ASSIGNED mnt-by: RIPE-NCC-END-MNT mnt-by: BRSK-MNT created: 2021-01-15T14:11:43Z last-modified: 2026-01-20T14:59:28Z source: RIPE % 2 routing policy lines (import/export) not shown