Security firm Synthient has launched a free-to-use and searchable online database of known proxy IPs

Synthient
Residential proxies pose numerous challenges to online platforms. Static indicators fall short, with residential proxy providers using sketchy mobile SDKs or free VPN apps to build large pools of IP addresses. Attackers can use these IP addresses to conceal their attacks making it appear as if each request is coming from a legitimate device. This latest release of Synthient V3 aims to improve the identification of leased IP addresses and the detection of active proxies...
Synthient (synthient.com)