Figure 6: Using Nslookup with MX serverÕs IP address to verify availability of reverse DNS lookup

C:\>nslookup -q=ptr 64.202.166.12

Server: win2k3r2ee.essential.local

Address: 192.168.1.10

Non-authoritative answer:

12.166.202.64.in-addr.arpa name = mail.TheEssentialExchange.com

C:\>