Introduction to DNS
When visiting a site, we only need to open your browser and enter, for example: www.baidu.com can be resolved to the site in order to facilitate long remember the need to enter IP addresses to visit, then the corresponding DNS domain name. resolve to an IP address, which is the DNS name resolution.
DNS is concerned with the investigation: identifying who owns a particular route between the domain or range of IP addresses, DNS information and identification of target defines the actual domain name and IP address of the target.
1. whois query
whois address recognition is assigned to the site, including information about the data registered user domain name or IP address, and so on.
2. dmitry inquiry
dmitry searches subdomains, email address, a TCP scan. -o ease of analysis can be used to query the information written to a text file. Other commands can specify a query
3. nslookup query
nslookup queries can refer dns server is not specified as the default dns server