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you can only find ip addresses in the iis logs.
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You wont be able to get a definitive list - one IP can have many domain names associated with it so even doing a reverse look up you can't be certain the domains you get are correct. A list of IP addresses accessing your server is far more accurate.
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give Glasswire a try - I have used this to look at who is communicating with servers in different scenarios - and its free, at that price you could download 2 copies :)
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How can I find distinct list all domains are accessing my IIS webserver in last 1 month<br />
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for example <br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href="http://www.myserver.com" rel="ugc">www.myserver.com</a><br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href="http://Demo1.myserver.com" rel="ugc">http://Demo1.myserver.com</a><br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href="http://Demo.myserver.com" rel="ugc">http://Demo.myserver.com</a>
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How can I find distinct list all domains are accessing my IIS webserver in last 1 month

for example 
           www.myserver.com
           http://Demo1.myserver.com
           http://Demo.myserver.com

how to list all domains accessing my server

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.