Windows Update Servers IP Address Range

Could anyone advise what IP Address range is used by windows update, we need to add these into our firewall to allow our servers outbound access. Thank You

You might see this related (but inconclusive) discussion from April 2009 =>



For security purposes, the IP address for the Windows Update web site constantly changes and it is not a fixed address. Also, there is no official publication of the IP addresses. We normally advise against defining IP addresses on the firewall for this purpose. Instead, we suggest either allowing all outbound connections to http & https ports or defining the DNS addresses as permitted destinations for traffic via the firewall.


For up-to-date information about the IP's being used by Windows Update, use the DNS system, as this is the only reliable up to date source of information. If you use DNS, make sure the following destination hosts are specified:







Source: (13 Jan-11)


~Robear Dyer (PA Bear)
Microsoft MVP (Windows Client) since October 2002

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Question Info

Last updated July 29, 2020 Views 80,328 Applies to: