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                        duckdns.org www.duckdns.org
I know its on your aggressive list, but this is a Dynamic DNS service (same as noip.com or dyn.com) As you are not blocking noip, I think it would also make sense to not block duckdns It is not malicious, though I guess it could be used by malware to track your IP.
Hmm.... you make a good argument to add noip.com and dyn.com