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What IP addresses and user agents are used by Siteimprove?

Modified on: Tue, 31 Oct, 2023 at 11:05 AM

Note: This article provides details for the IP addresses and user-agent strings used by Siteimprove on your website. You should verify that your IT network administration team allows the IPs and user-agent strings for the services you use. This will ensure the services are not blocked. You can download a text file containing all the IP addresses for use when configuring your allow list.

This article has been updated with new IPs on March 27, 2023, to also include the IP addresses that were added in 2022. For a list of IP addresses added in 2022 see article - IP address added to the Siteimprove crawler bot in 2022.

Please reach out to customer support if you have any questions about the information in this article. 

Content suite crawler IP addresses and user agents

Note: This list includes IP addresses and user agents used for the Siteimprove content suite (i.e. Quality Assurance, Accessibility, Policy, and SEO). Crawls run on ports 80 for HTTP and 443 for HTTPS.

Content suite IP addresses

The following IP addresses are used to crawl and check your website: (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (Global) (USA) (USA) (Australia) (France) (Netherlands) (Japan) (Germany)

Content suite user agents

User agents can contain full user agent strings and user agent tokens.

Full user agent stringsUser agent tokens
A full user agent string is a full description of the crawler and appears in the request and your website logs. (Note: version changes may occur)A user agent token is used in the "user agent:" line in robots.txt to match a crawler type when writing crawl rules for your site.
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0) SiteCheck-sitecrawl by Siteimprove.comSiteimproveBot-Crawler
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0) LinkCheck by

Not applicable




Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0) Image size by
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0) Probe by
CSS Validator: Jigsaw/2.3.0 W3C_CSS_Validator_JFouffa/2.0

Siteimprove Analytics IP addresses

This IP address is used by the Behavior Map Service in Siteimprove Analytics. In many cases, you will not see this in your website logs as it is often behind one of the crawler IP proxies listed above. (Global - Behavior Map Service)

Siteimprove Performance IP addresses

These IP addresses are used for performance monitoring by the Siteimprove Performance product. Please be aware that the performance 'url-precheck' service uses the user-agent string 'siteimprove-lookup'. (USA Midwest + Northeast) (USA South) (USA West) (Western Europe) (Great Britain and Ireland) (Australia) (Japan) (South America) (Northern Europe) (Canada) (Hong Kong)

Report and email IP addresses

Note: Emails are sent from the domain

General email IPs

The following IP addresses are used to send out Siteimprove emails (e.g. welcome emails, forgot password emails, report emails, etc.) but not including the Response alert email IPs. - Receiving emails - Receiving emails - Viewing Dashboard reports and module data linked from email ( and

Service Hosting IP address

The hosting IP address for the Siteimprove Services are as follows:

Siteimprove Platform


Siteimprove login -


Single Sign-On version 2 -


Note: Crawling is not carried out from this IP address however this IP address may be required, for example, in a restricted CMS environment when a customer wishes to use the Siteimprove CMS Plugin. 


The following domains should not be blocked when using the services provided by Siteimprove:

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Text file of IP addresses


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