IIS url resolving

does company1.web.com.uk resolve to web.com.uk? or one 开发者_JS百科has to configure this with the DNS server?

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You have to configure it on both DNS server and IIS web site.

You may wish to configure DNS wildcard record to point all subdomains (e.g. company1.web.com.uk, company2.web.com.uk, www.web.com.uk etc.) to the same IP address as web.com.uk.