It can be anything! An apex, subdomain, or even a URL.
Results for*.enterprise.slack.com.slack.tests.proxyqa.myshn.eu
www.*.enterprise.slack.com.slack.tests.proxyqa.myshn.euenterprise.slack.com.slack.tests.proxyqa.myshn.euslack.com.slack.tests.proxyqa.myshn.eucom.slack.tests.proxyqa.myshn.euslack.tests.proxyqa.myshn.eutests.proxyqa.myshn.euproxyqa.myshn.eumyshn.eueu