Stellarbeat.io has a list of hundreds of horizon servers, but if you try to connect to any of them with a simple GET request (like to get account info), it immediately closes the connection.
Are they all for private use?
For example, https://169.47.111.126:11625/accounts/GAHLAL3CCAW5FCFDIKDVH3I2WR46DAJJT75SMZ2OSXIFQXSP4QDRV57C or any other URL listed on stellarbeat.io just immediately closes the connection.