It can be anything! An apex, subdomain, or even a URL.

Results forchatbotdevelopers.co.uk

Domain Name	First seen	Still exists
cpcalendars.chatbotdevelopers.co.uk	2021-10-17T21:15:32.614Z
autodiscover.chatbotdevelopers.co.uk	2021-10-17T21:15:32.614Z
cpanel.chatbotdevelopers.co.uk	2021-10-17T21:15:32.614Z
cpcontacts.chatbotdevelopers.co.uk	2021-10-17T21:15:32.614Z
webdisk.chatbotdevelopers.co.uk	2021-10-17T21:15:32.614Z
webmail.chatbotdevelopers.co.uk	2021-10-17T21:15:32.614Z
mail.chatbotdevelopers.co.uk	2018-07-07T11:28:46.332Z
www.chatbotdevelopers.co.uk	2018-07-07T11:28:46.332Z