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Pan domain name Wildcard Domain

Pan-domain name Wildcard Domain is a special form of domain name. It uses an asterisk as the first level of the domain name. For example, * .baidu.com uses an asterisk as the secondary part of the domain name. In domain name resolution, a pan-domain name corresponds to an IP address. At this point, both a.baidu.com and tax.baidu.com resolve to the same IP address. Using pan-domain names, you can make domain names support unlimited subdomains. Because any subdomain name entered by the user can be resolved to the same IP address. At the same time, it can also prevent users from entering the wrong subdomain name and not being able to access the website.

In information collection, penetration testers often need to violently scan sub-domain names. If the domain name holder enables pan-domain name resolution, it may cause sub-domain name scanning to fail. Therefore, before brute force scanning, you can parse an impossible subdomain name to determine whether it can be resolved, such as the domain name adbp15rub.baidu.com.

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