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Sorry, we have no information about ns1.sweetgate.com. sweetgate.com is a domain controlled by two nameservers at sweetgate.com themselves. They are on different IP networks.

sweetgate.com
ns records
ns-1.sweetgate.com
+ 216.187.84.46 216.187.84.0/22 AS13768  
+ ---  
ns-2.sweetgate.com
+   AS?  
ip numbers using ptr to this host
69.90.98.19