Friday, December 17, 2010

Google Public DNS

Few people are aware of this but Google offers a DNS service.

This is particularly useful in a number of situations.

*If you are inside a corporate firewall and want to test host DNS entries appear to the outside world.

*If you don't trust your local ISP, or their DNS is having issues.

I often run scripts to check massive blocks of IP's

#while read ADDR
for ADDR in $IPLIST; do
 DNSR=`host $ADDR | tail -1 | awk ' {print $NF}' | sed 's/3(NXDOMAIN)/NONE/'

echo  "$HOST : $ADDR $DNSR" >> ADDR-LIST.txt


Google Public DNS IP addresses

The Google Public DNS IP addresses are as follows:

Using Google Public DNS, A DNS Number for Faster Browsing

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