It can be anything! An apex, subdomain, or even a URL.
Results for*.global.ssl.fastly.net.slack.euproxyqa.myshn.eu
www.*.global.ssl.fastly.net.slack.euproxyqa.myshn.euglobal.ssl.fastly.net.slack.euproxyqa.myshn.eussl.fastly.net.slack.euproxyqa.myshn.eufastly.net.slack.euproxyqa.myshn.eunet.slack.euproxyqa.myshn.euslack.euproxyqa.myshn.eueuproxyqa.myshn.eumyshn.eueu