"-A IPAddress : Displays the NetBIOS name table of a remote computer, specified by the IP address (in dotted decimal notation) of the remote computer."
With the program Check Host you can easily monitor a server or the services of a server. Therefore define which host or ip address should be monitored. Additionally you can choose the check method: either with a ping or by establishing a socket connection (optionally TCP or UDP) on any port.
whatsmydns.net is an online service that allows you to instantly perform a DNS lookup to check a hostnames current IP Address and other DNS information against a selection of random name servers around the world. This is especially useful to check the current state of DNS propagation after making changes to your domains zones.