For Windows, you can use SimpleWall, which uses Windows Filtering Platform underneath. The UI is nice, it's very efficient and works systemwide, deeply integrat

For Windows, you can use SimpleWall, which uses Windows Filtering Platform underneath. The UI is nice, it's very efficient and works systemwide, deeply integrated with Windows' network stack. You can set domain/IP rules, but it's generally more oriented towards per-application basis blocking/allowing.