How long does it take for a domain to become available?

After you have registered a domain name with No-IP, it will take 24-72 hours for your domain name to propagate to all of the root DNS servers. Your domain may show up in the WHOIS database before it has fully propogated to the root DNS servers.

For More Information Please Refer: https://www.noip.com/support/knowledgebase/how-long-until-the-domain-i-just-registered-will-become-active/