Provided is a communication device including: an address acquiring unit that acquires an IP address; a generating unit that generates, on the basis of the acquired IP address, a special reverse lookup domain name which is different from a standard reverse lookup domain name serving as a key for obtaining a domain name corresponding to the acquired IP address through a reverse DNS lookup; and a reverse-DNS-lookup processing unit that performs the reverse DNS lookup using the generated special reverse lookup domain name as a key, and acquires node descriptor data, which is different from the domain name and is associated with a communication device corresponding to the IP address acquired by the address acquiring unit.