Find a hostname for an IP address by performing a reverse DNS lookup. For that, open the tool: Hostname to IP Resolver. Enter an IP address. Here is a sample, enter IP address 220.127.116.11 and click on the "Check Now" button. The tool performs the reverse DNS lookup and provides you the domain or hostname associated with the IP address. I'm having a similar issue here in that I can ping the container IP but not the hostname specified. I have checked my DHCP server and it isn't registering a host name so it looks the container isn't giving out a hostname at all. My container is in bridge mode so nothing should be getting in the way.