DDomain is unique name that used for facilitate user access to information on computer servers in internet network. Before domain to access information on computer servers used IP Address in the form of long series of numbers. Therefore, domain is used to simplify the user to access information on computer servers and easier for users to remember. For example : www.cekdom.com with IP Address : 119.82.226.14. www.cekdom.com a domain name, so as to access this website CekDom just type www.cekdom.com or cekdom.com in address bar of web browser you use.

Based on phase of life, domain is divided into several types :

1. Fresh Domain
Fresh Domain is a term used for domain that is truly new, registered in registrar, domain is not registered with registrar before and did not have any history.
2. Active Domain
Active Domain is domain has been purchased and has predetermined active period up to this domain will be Expired Domains, if active period is not extended.
3. Expired Domain
Expired Domains is domain that considered valuable, desirable or ever have high traffic and popularity, so that domain will be taken as soon as domain is released.
4. Dropped Domain
Dropped Domains is domain that have PageRank but domain has expired and was not renewed, when domain is registered again seen as having very young age but already has PageRank, backlinks and previous history.

From domains that are already dead (Expired Domain) and deleted (Dropped Domain), there are many people who use these domains for various purposes like to buy it at a low price and then sell them with higher price, make a website with a domain, then do Search Engine Optimization (SEO) so that it can generate revenue from Google Adsense, Infolinks, Chitika, Paid To Reviews (PTR) or even create a website with sophisticated system or attractive appearance then sold, certainly much higher selling price than price of real domain that once purchased resale.

Hunting expired and dropped domain is an activity that often performed by online business/publisher. Activities that require very long time and high accuracy, because to get desired domain and has high prospects, online business/publisher (buyer) must check one by one popularity of some expired and dropped domain them seek to prove that popularity is valid, then they buy domains. To obtain desired domain by online business/publisher (buyer), it takes a decision support system that will be purchased domain election using Analytic Hierarchy Process (AHP) based web by comparing existing criteria (domain popularity). Therefore sprang website called CekDom.