Online Network Tools

NSLookup

This tool lets you query the domain name system for information.

If you want to see the IP addresses a hostname maps to, enter the hostname and select A (IP4 address) from the pulldown menu.

To see the hostnames that an IP address claims to be, enter the IP address and select PTR (Reverse DNS) from the pulldown menu.

To check the SPF records for a domain, enter the domain and select TXT (used for SPF and DKIM) from the pulldown menu.

This tool uses our caching DNS server, so the view you see here is what a typical user may see. If you've recently changed your DNS records you may still see the old values returned here, from cache, the same way as they may be cached by other ISPs.