Subdomain Takeover

Dangling CNAME Records(make DNS records but never CLAIM)
we will claim them from github,tumblr,heroku,shopify,zendesk,AWS
you can use automate tool for this:
subjack
subzy: subzy -targets domains.txt
aquatone
https://github.com/EdOverflow/can-i-take-over-xyz
try this tiil findomain : its uses multiple tool as well.
finddomain -t www.xyz.com -r