Discloses is a method for providing a packet data service in a wireless communication system. A packet data service node (PDSN) or a home agent (HA) allocates an IP (Internet Protocol) address to a mobile station and then registers the allocated IP address information in a DNS (Domain Naming System) server along with a domain name of the mobile station. Alternatively, upon receiving an accounting request message from the packet data service node, an AAA (Authentication, Authorization and Accounting) server registers the IP address information of the mobile station in the DNS server in association with the domain name of the mobile station. Thus, a correspondent node (CN), though it does not recognize the IP address of the mobile station, can access the mobile station using the domain name.