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
- Trust score 65 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
About brsk
Internet service provider in the United Kingdom.
Network profile
Source: PeeringDB →AS51809 — global IP footprint
Cities where AS51809 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 31.98.80.0/20 | 4.1K |
0.0%
|
BRSK Limited | US | — | — |
| 88.97.176.0/20 | 4.1K |
0.0%
|
BRSK Limited | GB | England | Manchester |
| 195.40.32.0/20 | 4.1K |
5.9%
|
BRSK Limited | GB | England | City of London |
| 31.98.72.0/21 | 2.0K |
0.0%
|
BRSK Limited | US | — | — |
| 45.61.104.0/21 | 2.0K |
97.0%
|
BRSK Limited | US | — | — |
| 63.135.72.0/21 | 2.0K |
1.2%
|
BRSK Limited | GB | England | Manchester |
| 88.97.160.0/21 | 2.0K |
0.0%
|
BRSK Limited | GB | England | Bradford |
| 104.238.40.0/21 | 2.0K |
0.5%
|
BRSK Limited | US | — | — |
| 195.40.48.0/21 | 2.0K |
1.7%
|
BRSK Limited | GB | — | — |
| 45.41.148.0/22 | 1.0K |
0.0%
|
BRSK Limited | US | — | — |
| 45.82.140.0/22 | 1.0K |
0.1%
|
BRSK Limited | GB | England | Manchester |
| 67.208.52.0/22 | 1.0K |
0.5%
|
BRSK Limited | GB | England | Sale |
| 185.138.196.0/22 | 1.0K |
0.9%
|
BRSK Limited | GB | England | Manchester |
| 104.238.58.0/23 | 512 |
0.0%
|
BRSK Limited | US | — | — |
| 104.238.62.0/23 | 512 |
0.0%
|
BRSK Limited | US | — | — |
| 185.232.119.0/24 | 256 |
0.4%
|
BRSK Limited | GB | England | City of London |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS51809 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 |
|---|---|---|
| 45.61.104.0/21 | 15,169 | 2026-09-13 03:24:59 |
| 45.82.140.0/22 | 15,153 | 2026-09-13 03:24:59 |
| 45.41.148.0/22 | 15,114 | 2026-09-13 03:24:59 |
| 88.97.176.0/20 | 15,015 | 2026-09-13 03:24:59 |
| 31.98.72.0/21 | 15,008 | 2026-09-13 03:24:59 |
| 63.135.72.0/21 | 14,985 | 2026-09-13 03:24:59 |
| 31.98.80.0/20 | 14,973 | 2026-09-13 03:24:59 |
| 88.97.160.0/21 | 14,967 | 2026-09-13 03:24:59 |
| 67.208.52.0/22 | 14,896 | 2026-09-13 03:24:59 |
| 104.238.40.0/21 | 14,790 | 2026-09-13 03:24:59 |
| 104.238.58.0/23 | 14,760 | 2026-09-13 03:24:59 |
| 104.238.62.0/23 | 14,746 | 2026-09-13 03:24:59 |
| 185.138.196.0/22 | 14,360 | 2026-09-13 03:24:59 |
| 185.232.119.0/24 | 14,317 | 2026-09-13 03:24:59 |
| 195.40.35.0/24 | 14,310 | 2026-09-13 03:24:59 |
| 195.40.34.0/24 | 14,289 | 2026-09-13 03:24:59 |
| 195.40.32.0/24 | 14,268 | 2026-09-13 03:24:59 |
| 195.40.36.0/24 | 14,249 | 2026-09-13 03:24:59 |
| 195.40.50.0/24 | 14,234 | 2026-09-13 03:24:59 |
| 195.40.33.0/24 | 14,215 | 2026-09-13 03:24:59 |
| 195.40.37.0/24 | 14,214 | 2026-09-13 03:24:59 |
| 195.40.43.0/24 | 14,211 | 2026-09-13 03:24:59 |
| 195.40.53.0/24 | 14,206 | 2026-09-13 03:24:59 |
| 195.40.55.0/24 | 14,206 | 2026-09-13 03:24:59 |
| 195.40.48.0/24 | 14,201 | 2026-09-13 03:24:59 |
| 195.40.52.0/24 | 14,196 | 2026-09-13 03:24:59 |
| 195.40.40.0/24 | 14,192 | 2026-09-13 03:24:59 |
| 195.40.46.0/24 | 14,192 | 2026-09-13 03:24:59 |
| 195.40.54.0/24 | 14,190 | 2026-09-13 03:24:59 |
| 195.40.41.0/24 | 14,190 | 2026-09-13 03:24:59 |
| 195.40.42.0/24 | 14,185 | 2026-09-13 03:24:59 |
| 195.40.44.0/24 | 14,184 | 2026-09-13 03:24:59 |
| 195.40.45.0/24 | 14,184 | 2026-09-13 03:24:59 |
| 195.40.49.0/24 | 14,174 | 2026-09-13 03:24:59 |
| 195.40.38.0/24 | 14,171 | 2026-09-13 03:24:59 |
| 195.40.51.0/24 | 14,160 | 2026-09-13 03:24:59 |
| 195.40.47.0/24 | 14,151 | 2026-09-13 03:24:59 |
| 195.40.39.0/24 | 14,143 | 2026-09-13 03:24:59 |
| 87.192.96.0/21 | 2 | 2026-07-28 13:59:14 |
Frequently Asked Questions
What is AS51809?
AS51809 is an Autonomous System Number assigned to BRSK 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 AS51809 announce?
AS51809 announces 30.0K IPv4 addresses distributed across 16 routed CIDR prefixes. The network is registered in United Kingdom.
Who operates AS51809?
AS51809 is operated by BRSK Limited. The organization is based in United Kingdom. You can view all IP ranges and related ASNs on the organization page.
What country is AS51809 registered in?
AS51809 is registered in United Kingdom. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
