Rijnzael wrote:you use OpenDNS as your nameserver, and when nmap tries to get the PTR record for xxx.xxx.236.10.in-addr.arpa (the FQDN of IP addresses when attempting to get an A or CNAME record pointer to them), OpenDNS responds with the name hit-nxdomain.opendns.com as the A record corresponding to 10.236.xxx.xxx. The actual IP address which corresponds to hit-nxdomain.opendns.com is 126.96.36.199, which nmap resolves to provide you the most information possible.
Change your nameservers to 188.8.131.52 and 184.108.40.206 and you'll get the correct results (you'll get a blackhole response, since 10.x.x.x is private network address and isn't WAN routeable).
Before you continue learning about nmap, I'd recommend learning about IP addressing and how DNS resolution works, since you seem to think you need to hide your 10.x.x.x address.
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