get all Google ipv4 subnets for a iptables firewall for example

nslookup -q=TXT | grep -Eo 'ip4:([0-9\.\/]+)' | cut -d: -f2
a bit shorter, parenthesis not needed but added for clarity
Sample Output

1 Alternatives + Submit Alt

What Others Think

The grep is just a regular expression for ip adresses... thats a duplicate here. :-/
emphazer · 154 weeks and 3 days ago
You can leave something like that as comment but not copying... The key is the nslookup command and not the grep....
emphazer · 154 weeks and 3 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?

You must be signed in to comment.

What's this? is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.


Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: