Nslookup.io allows users to find DNS records for a domain name. It provides the same information as command line tools like dig and nslookup, but can be accessed through a web browser. Users can enter a domain name and view all the DNS records for that website. NsLookup does not cache the DNS responses it shows, but the DNS servers that are queried usually do respond with a cached record set. The tool supports various DNS record types and allows users to select from a range of DNS servers. It can be useful for checking the configuration of DNS records, monitoring DNS propagation, and sharing results with others.