that mean if the website not valid anymore.
it can be deleted or removed.suspend by the Web hosting or can be Block by the internet Provider.
but to make sure if the website is still valid or not valid,
try to input the ip address of that website at the Address bar web browser you've use.
for knowing ip address from website,open Command Prompt(CMD),
type PING (space) website Address and the enter.
to open CMD,click start > click RUN... > type CMD > click OK/Enter
for Example see the Picture below :
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