Help Understanding DNS Lookup Results

Comodo Secure DNS - DNS Help - DNS
1

Hi:

I just changed my DNS servers to those listed on the Comodo Secure
DNS page.

After doing so, I did several sample DNS nslookups; one each for Ebay,
mIRC, and Google. Pasted below are the DNS answers:

C:>nslookup www.ebay.com

Non-authoritative answer:
Name: www.ebay.com.wi.rr.com
Address: 92.242.144.50

C:>nslookup www.mirc.com

Non-authoritative answer:
Name: www.mirc.com.wi.rr.com
Address: 92.242.144.50

C:>nslookup www.google.com

Non-authoritative answer:
Name: www.google.com.wi.rr.com
Address: 92.242.144.50

My question is… why do all of the answers append my lookup with my
ISP’s domain? Also, why do all three lookups point to the same IP address?

How would I find out, through a lookup, the real IP addresses of the sites
I’m searching on?

Regards.

2

Try appending a full stop (period) to the end of the domain name you’re querying.

How would I find out, through a lookup, the real IP addresses of the sites I'm searching on?

Regards.

Is there specific information you require, or just the IP address of a given host?

3

Thanks again, Radaghast, for replying. This works great! I now get Google’s
real addresses:

Non-authoritative answer:
Name: www.l.google.com
Addresses: 173.194.67.104, 173.194.67.106, 173.194.67.99, 173.194.67.147
173.194.67.103, 173.194.67.105
Aliases: www.google.com

I’ve noticed, as in the past, they have several IP addresses, and this raises yet
another question, if you don’t mind me imposing upon you.

Do they use this many addresses for redundancy, or to spread their traffic over
various ports? Further, how does a typical client, like IE or Firefox, determine
which of those IP addresses to use?

Is there specific information you require, or just the IP address of a given host?
No specific information; just the IP address. Thanks to you, I once again have access to that information.

Regards.

4

Google have datacenters all over the globe and will serve from different subnets based on location. You can get a better idea of the scope by looking at http://www.robtex.com/route/173.194.0.0-16---google.html

5

Thanks again… I will definitely check that out.

Regards.

6

I may have answered my own question through further exploration.
This is a part of my ipconfig /all resutls:

Windows IP Configuration

    Primary Dns Suffix  . . . . . . . :
    DNS Suffix Search List. . . . . . : wi.rr.com

Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix  . : wi.rr.com

Regards.

7

Almost certainly. Unless your ISP (Road Runner?) specifically requires you to use that, you can probably remove it.