List of online Network tools to use for free.
DNS Lookup - Check the dns records of a domain
Easy tool to check the dns records of a domainname and to see what dns servers are set for this domain name.
IP address information, check an ipv4 or ipv6 address
See what information you can get with just an ip v4 en ip v6 address
What is my ip v4 address?
What ip v4 address do you use at this point? With this tool you can easily see what ip address is used to surf the internet.
Check the ip address of your website
What ip 4 and ip 6 address is used by your website at this point and where is it hosted?