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How do I check if the name servers (DNS) are correct?


The 1&1 system checks if the DNS you are changing to is correct. A correct DNS
resolves to an IP Address and this IP Address resolves to the same domain name.
For example, ns27.1and1.com resolves to 217.160.224.3 and 217.160.224.3 resolves to ns27.1and1.com.

You can do a simple check to see if the DNS you have is correct.
Please visit DNSStuff.com.

1. Type in the name server under DNS Lookup (3rd column) and click Lookup.
dns check 1

2. Copy the IP address and click the Back button.
dns check 2

3. Enter the IP Address under Reverse DNS Lookup. (2nd column) Click RevDNS.
dns check 3

4. The answer should be the name server.
dns check 4

A minimum of 2 name servers is required. The name servers should be on different Class C Networks.

For example:
ns1.something.com 217.160.247.1
ns2.something.com 217.160.247.2
will not work because the IP addresses of the name servers are in the same Class C (247) network.

Command prompt (Linux)
myshell:~> host ns27.1and1.com
ns27.1and1.com has the address 217.160.224.3

myshell:~> host 217.160.224.3
3.224.160.217.in-addr.arpa domain name pointer ns27.1and1.com

SD1B906


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