If you are not sure if the website you want to visit is safe, you can check it out here. Enter the address (url) of the website and see the invisible elements, such as a header or meta data.
site address:adserver.adtech.de/adserv/3.0/1301/5289865/0/170/ADTECH;loc=30...
site title:

Header

HTTP/1.1 200 OK
Cache-Control no-store, no-cache
Date Tue, 25 Sep 2018 05:54:14 GMT
Expires Mon, 15 Jun 1998 00:00:00 GMT
Pragma no-cache
Server nginx
Content-Length 1

Load Info

page size1
load time (s)2.511292
redirect count0
speed download0
server IP152.195.39.132


* all occurrences of the string "http://" have been changed to "htt???/"