The DNS Sleuth

An online tool for checking of DNS zones

Sleuth version 1.4.4 (21-05-08)

Written by Martin Mares <>

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.

If this page looks a bit fruitless, but otherwise displayed correctly, it's probably because your browser doesn't support the Cascading Style Sheets which are The Right Way to define presentation of HTML documents. In case this page looks a bit weird, your browser probably tries to support the style sheets, but does it wrongly (hello, Netscape 4).

New query
Domain: Verbose output:
Server name: Server IP:

Please send your bug reports and suggestions to Martin Mares.