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what are the IP addresses relative to ns1.bdm.microsoftonline.com and
As DNS redirection on register.com requires DNS names as well as IP addresses
If you need to see the current IP address for a domain name, just use the ping command to ping that domain name. It will automatically resolve the IP address it is currently set to. That said, when redelegating nameservers, you don't want to use IP addresses because of the fact that IP addresses for things like nameservers can potentially change. Your domain registrar should be able to change just the nameserver entries for your DNS records to our Microsoft Online name servers and that should be all you need do.
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