watch lsof -i :80

whois surfing my web ?


3
By: hypnojazz
2009-07-19 08:24:06

These Might Interest You

  • Useful if you f.i. want to block/allow all connections from a certain provider which uses successive netnames for his ip blocks. In this example I used the german Deutsche Telekom which has DTAG-DIAL followed by a number as netname for the dial in pools. There are - as always ;) - different ways to do this. If you have seq available you can use net=DTAG-DIAL ; for i in `seq 1 30`; do whois -h whois.ripe.net $net$i | grep '^inetnum:' | sed "s;^.*:;$net$i;" ; done or without seq you can use bash brace expansion net=DTAG-DIAL ; for i in {1..30}; do whois -h whois.ripe.net $net$i | grep '^inetnum:' | sed "s;^.*:;$net$i;" ; done or if you like while better than for use something like net=DTAG-DIAL ; i=1 ; while true ; do whois -h whois.ripe.net $net$i | grep '^inetnum:' | sed "s;^.*:;$net$i;" ; test $i = 30 && break ; i=$(expr $i + 1) ; done and so on. Show Sample Output


    2
    net=DTAG-DIAL ; for (( i=1; i<30; i++ )); do whois -h whois.ripe.net $net$i | grep '^inetnum:' | sed "s;^.*:;$net$i;" ; done
    drizzt · 2009-08-01 05:28:19 0
  • Outputs multiple whois from a plain text file.


    -2
    for domain in `cat list_of_domains.txt`; do echo $domain; whois $domain >> output.txt; done
    pathcl · 2010-02-15 17:13:45 1

  • 0
    netstat -np --inet|awk '/firefox/{split($5,a,":");z[a[1]]++} END{for(i in z){system("whois " i)}}'|less
    sesom42 · 2013-12-17 08:58:35 1
  • This can be used in scripts, to find out the origin of target IP etc. Show Sample Output


    -5
    x=192.168.1.1; whois $x > $x.txt
    sxiii · 2011-01-17 03:33:49 0
  • Change the $domain variable to whichever domain you wish to query. Works with the majority of whois info; for some that won't, you may have to compromise: domain=google.com; for a in $(whois $domain | grep "Domain servers in listed order:" --after 3 | grep -v "Domain servers in listed order:"); do echo ">>> Nameservers for $domain from $a Note that this doesn't work as well as the first one; if they have more than 3 nameservers, it won't hit them all. As the summary states, this can be useful for making sure the whois nameservers for a domain match the nameserver records (NS records) from the nameservers themselves. Show Sample Output


    2
    domain=google.com; for ns in $(whois $domain | awk -F: '/Name Server/{print $2}'); do echo ">>> Nameservers for $domain from $a <<<"; dig @$ns $domain ns +short; echo; done;
    laebshade · 2011-05-08 04:46:34 0
  • It would be nice if commandlinefu.com had a better domain name. Will they pick one of the above; We'll see. Show Sample Output


    -11
    whois cmd.fu;whois cmdfu.com|grep -i cmdfu
    axelabs · 2009-02-19 08:57:50 3

What Others Think

on a big machine, this can be expensive (we used to joke about having an "lsof processor" on a multi-core machine...) ss or netstat will be much more efficient... ss -t 'sport = :http'
eichin · 461 weeks and 3 days ago
u're right eichin ;)
hypnojazz · 461 weeks and 2 days ago

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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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