AS51159 THINKSYSTEMSUK-ASN
Fraudex lists AS51159 as infrastructure that real customers rarely browse from: servers, VPN exits, proxies or bot networks. Every IP announced by this network comes back from /api/check with "is_bot": true.
Check an IP from AS51159
Look up any address in real time with the free IP checker, or from your own code:
curl "https://fraudex.xyz/api/check?ip=91.142.134.0" \ -H "X-API-Key: fx_your_key"
The answer includes the network (AS51159), the country and a VPN, proxy, Tor and bot verdict, in under a millisecond. Plans start at $40 for 30 days of unlimited lookups.
IPv4 ranges announced by AS51159
| First IP | Last IP | CIDR | Addresses |
|---|---|---|---|
| 91.142.134.0 | 91.142.134.255 | 91.142.134.0/24 | 256 |
| 91.228.115.0 | 91.228.115.255 | 91.228.115.0/24 | 256 |
| 91.239.124.0 | 91.239.125.255 | 91.239.124.0/23 | 512 |
| 185.62.84.0 | 185.62.87.255 | 185.62.84.0/22 | 1,024 |
| 194.187.252.0 | 194.187.252.255 | 194.187.252.0/24 | 256 |
Questions about AS51159
Is AS51159 a VPN or hosting network?
Yes. Fraudex lists AS51159 (THINKSYSTEMSUK-ASN) among the hosting, VPN, proxy and bot networks it flags, so visitors from it are usually servers or people hiding their real location rather than ordinary customers.
Which country is AS51159 registered in?
AS51159 is registered in United Kingdom. Individual addresses can be used elsewhere, so check the IP itself when location matters.
How many IP addresses does AS51159 have?
It announces 5 IPv4 ranges with 2,304 addresses in total.
How do I block traffic from AS51159?
Blocking a whole network by number goes stale as ranges change hands. It is more reliable to check each visitor's IP when they sign up, log in or pay: the Fraudex API returns the network and a VPN and bot verdict, so you can block, challenge or just log flagged traffic. See why an IP blocking API pays for itself.