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How can I check if a domain name is free or not?

Updated 8 May, 2020

If you want to check if a .se or .nu domain name is free or not, you can use the Free service. 
The free service is available here: http://free.iis.se/ 

The service responds with "free" if the domain is free and "occupied" if the domain is already registered. 
Here is an example, http://free.iis.se/free?q=example.se