get all Google ipv4 subnets for a iptables firewall for example

nslookup -q=TXT _netblocks.google.com | grep -Eo 'ip4:([0-9\.\/]+)' | cut -d: -f2
a bit shorter, parenthesis not needed but added for clarity
Sample Output
35.190.247.0/24
64.233.160.0/19
66.102.0.0/20
66.249.80.0/20
72.14.192.0/18
74.125.0.0/16
108.177.8.0/21
173.194.0.0/16
209.85.128.0/17
216.58.192.0/19
216.239.32.0/19

1 Alternatives + Submit Alt

What Others Think

The grep is just a regular expression for ip adresses... thats a duplicate here. :-/
emphazer · 1 week and 6 days ago
You can leave something like that as comment but not copying... The key is the nslookup command and not the grep....
emphazer · 1 week and 6 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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