This is an online version of Sleuth -- a detector of common errors in DNS zones.

To check a zone, just enter its name in the form below. You can explictly specify a name server to be asked for zone data and if its name isn't available from the public DNS, then also its IP address. If you select the verbose mode, you will also get a full dump of the zone at no extra cost.

If you want to run Sleuth on your own machine, just download the latest version from our FTP server. Sleuth is free software, you can freely use and distribute it according to the GNU General Public License.