Detect if www subdomain is present
74768
WWW to non-WWW Redirect with PHP
52968
Get the subdomain from a URL
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PHP Getting Domain Name From Subdomain
48933
What is a hostname versus a computer name versus a subdomain versus www?
50437
How to get the base domain name from an URL using PHP?
92715
How to determine current users who are logged in using a specific domain? | UNIX
88842
Easy way to change apache www location
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List of Stack Exchange subdomains that are not mentioned in "All Sites"
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Determine if Absolute or Relative URL
109194
Proper method to remove www from address using IIS URL Rewrite
78650
PHP get website root absolute URL in server?
86475
Powershell and checking for Site existence
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Top level domain/domain suffix for private network?
108379
How to validate domain name in PHP?
134094
Is it possible to find all DNS subdomains for a given domain name?
92128
Multi-level wildcard DNS matched by *.domain.com?
16161
How can I tell if I have static or dynamic IP Address?