The so-called "pan-domain name resolution" refers to: use wildcard * (asterisk) to make secondary domain names so that all secondary domain names point to the same IP address.
The use of pan-resolution
1. The domain name can support unlimited subdomains (this is also the biggest use of pan-domain name resolution).
2. Prevent the problem that the website cannot be accessed due to wrong input by users
3. Allow users who directly enter the URL to log in to the website to enter a concise URL to access the website
Pan domain name is very useful in practical use, such as the realization of unlimited second-level domain names Function, provide free URL forwarding, realize automatic allocation of free URLs in IDC departments, realize URL classification management in large enterprises, etc., have played a huge role.
Simply put, we enter www.xxx.com to enter the home page, and enter 1. xxx.com will also be resolved to www.xxx.com, no matter what we enter in 1, it will be resolved to www.xxx.com
Different from domain name resolution
, pan-domain name resolution is: *. Domain name resolution to the same IP.
Domain name resolution is: subdomain name. Domain name resolution to the same IP.
There will be a problem here, some subdomain scanning tools will have bugs when scanning a website
For example, a website has pan-domain name resolution, and the domain name is www.xxx.com
Then when we visit the 1.xxx.com website, it will automatically jump to www.xxx.com
So individual scanners will scan a large number of subdomains, but all subdomains are resolved to www.xxx.com