go to a 'whois' such as -
www.networksolutions.com/en_US/whois/index.jhtml
put in their url - in our case we were searching for adriatickayaktours.com
then something like this will appear -
Current Registrar: PAIRNIC
IP Address: 216.146.205.75 (ARIN & RIPE IP search)
IP Location: US(UNITED STATES)-PENNSYLVANIA-PITTSBURGH
Record Type: Domain Name
Server Type: Apache 2
Lock Status: ok
Web Site Status: Active
DMOZ no listings
Y! Directory: see listings
Secure: No
E-commerce: Yes
Traffic Ranking: Not available
Data as of: 22-Apr-2008
do an internet search for the current registrar - in our case PAIRINC
find their complaints department and send them an email.