How to check IIS version in windows server?

You can check IIS versions below methods

1. Using GUI

You can also open IIS by clicking on "windows +R" key and type "inetmgr" and press OK.

Once IIS is opened, you can navigate to "Help" menu and click on: "About Internet Information Services".

OR

You can open the GUI console, by navigating to below folders in Windows server

%windir%\system32\inetsrv\InetMgr.exe

and we go to the "Help" menu and click on: "About Internet Information Services".

2. Using Powershell

Open powershell in Administrator mode and then use below command

[System.Diagnostics.FileVersionInfo]::GetVersionInfo("$env:SystemRoot\system32\inetsrv\InetMgr.exe").ProductVersion

3. Using RegEdit

You can locate IIS version by navigating to regedit location below

HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ InetStp \ VersionString

The value of VersionString will indicate the IIS version installed on server.

Here are Server and IIS version

IIS version   Built-in  
5.0           Windows 2000
5.1           Windows XP Pro
6.0           Windows Server 2003
7.0           Windows Vista and Windows Server 2008
7.5           Windows 7 and Windows Server 2008 R2
8.0           Windows 8 and Windows Server 2012
8.5           Windows 8.1 and Windows Server 2012 R2
10.0 v1607    Windows Server 2016 and Windows 10.*
10.0 v1709    Windows Server 2016 v1709 and Windows 10.*
10.0 v1809    Windows Server 2019  and Windows 10.* October

That's it.