Use IP instead of hostname

[hckhanh]

When I try to use IP instead of the domain name. It returns false even if the IP has existed. Can we support it?

[sindresorhus]

Sure. I think it was just an oversight to not support that. PR welcome.

[tukusejssirs]

I had similar issue on CentOS 8 (non-Stream, minimal server), but not on Fedora 31 (workstation).

The workaround is to pass the port number to the IP address (e.g. 192.168.1.5:80); then it works as expected.