The security of domain title registrations is an increasing concern for domain name registrants and registrars. However, there are steps you might take to increase the security of your domain name registrations.
Domain Name Security is almost always neglected by most organisations. Infact a large number of hacking attempts do not really absolutely need to happen at the Web Server level. Most hackers may fairly disrupt your business by simply hijacking your Domain Name. Most Registrars assign paramount importance to Domain Security. Its important you chosoe the RIGHT Registrar and who has implemented several security measures and safety locks to prevent your Domain Name from getting Hijacked or taken over.

There are basically TWO basic options offered by Registrars :

Password based Security
All Domain Names have a password based security. All Domain Names belonging to a particular Customer might only be modified through the right Username and Password combination of that customer.

Domain LOCK - this is a MUST have for all due to the recently announced TRANSFER Policy by ICANN (Visit : http://www.icann.org/transfers/policy-12jul04.htm)

Several TLD Registries have the ability to create what is known as a Domain LOCK. Most Registrars offers this feature to Customers whereby you may place a LOCK on your Domain Name. Once a Domain Name is locked NO modifications could be made to the Domain by ANYONE. The Domain Name might not even be transferred to another Registrar. The Domain will remain in a LOCKED status until you yourself choose to remove the LOCK. This feature is by far the most powerful feature to ensure that noone may generate any changes to your Domain Name without your express approval.
Ok..what should you do now ?

If you own a domain title for your business or personal use, run, do not stroll , to the phone, call the company you registered the name with, and generate sure that title is "locked down."

If you do not , you could easily lose your rights to that domain. And whether your Web site is an integral part of your business, or just keyed to your familys activities, waking up one morning without it could range from inconvenient to disastrous.

Just check the WHOIS of the domain. Every domain name will have a column STATUS in the whois.

Make sure it shows as below :
Domain Status : LOCKED

Note:This Domain Name is currently Locked. In this status the domain title cannot be transferred, hijacked, or modified. The Owner of this domain name may easily change this status from their control panel. This feature is provided as a security measure against fraudulent domain name hijacking.