Commands using whois (16)

  • Check if a domain is available and get the answer in just one line

    Returns nothing if the domain exists and 'No match for domain.com' otherwise.


    7
    whois domainnametocheck.com | grep match
    Timothee · 2009-08-11 13:33:25 17
  • Check if a domain is available for purchase

    A quick alias to check if a domain is already registered or if it's available for purchase. Show Sample Output


    5
    function canibuy { whois "$1" 2>/dev/null | grep -q 'Registrant' && echo "taken" || echo "available" }
    tyzbit · 2023-06-21 15:01:25 180
  • Block all FaceBook traffic


    4
    ASN=32934; for s in $(whois -H -h riswhois.ripe.net -- -F -K -i $ASN | grep -v "^$" | grep -v "^%" | awk '{ print $2 }' ); do echo " blocking $s"; sudo iptables -A INPUT -s $s -j REJECT &> /dev/null || sudo ip6tables -A INPUT -s $s -j REJECT; done
    koppi · 2016-04-08 11:30:12 61
  • Produces a list of when your domains expire

    Create a text file called domainlist.txt with a domain per line, then run the command above. All registries are a little different, so play around with the command. Should produce a list of domains and their expirations date. I am responsible for my companies domains and have a dozen or so myself, so this is a quick check if I overlooked any.


    3
    cat domainlist.txt | while read line; do echo -ne $line; whois $line | grep Expiration ; done | sed 's:Expiration Date::'
    netsaint · 2010-05-02 06:49:09 6
  • Query ip pools based on successive netnames via whois

    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 4
  • Check to make sure the whois nameservers match the nameserver records from the nameservers themselves

    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 4
  • whois filtering the important information


    1
    whois commandlinefu.com | grep -E '^\s{3}'
    ca9lar · 2019-04-09 21:09:30 76
  • geolocalize ip country


    0
    while read line; do pais=$(whois "$line" | grep -E '[Cc]ountry') echo -n "IP=$line Pais=$pais" && echo done <listaip
    pathcl · 2010-10-25 15:39:50 31
  • List contact infomation for Domain list

    Nice neat feedback showing contact infomation for as many domains as you wish to feed it. I used a list of domains, each one on a new line as supplied by our registar, as we needed to check they were all upto date and back them up as we are updating them all.


    0
    whois -H $(cat ./list_of_domains) | awk 'BEGIN{RS=""}/Registrant/,/Registration Service Provider:/ {print} END{print "----------------\n"}'
    djsmiley2k · 2011-01-11 12:55:34 3
  • check a list of domains registered on godaddy

    Found on https://bitcointalk.org/index.php?topic=55520.0


    0
    for i in `wget -O url|grep '<a rel="nofollow"'|grep http|sed 's|.*<a rel="nofollow" class="[^"]\+" href="[^"]*https\?://\([^/]\+\)[^"]*">[^<]\+</a>.*|\1|'`;do if test -n "$(whois $i|grep -i godaddy)";then echo $i uses GoDaddy;fi;sleep 20;done
    coinbitsdotcom · 2011-12-24 19:12:18 5
  • Produces a list of when your domains expire


    0
    cat domainlist.txt | while read line; do echo -ne $line; whois $line | grep Expiration ; done | sed 's:Expiration Date::'
    jun3337 · 2013-05-13 02:55:17 8
  • Block all traffic from an Autonomous System (AS) Network (e.g. Facebook)

    Retrieves AS route prefixes for IPv4 and IPv6, aggregates the routes to the minimal set, and adds netfilter rules to reject them. Relies on two helpers: IPv4 - "aggregate" by Joe Abley (package name 'aggregate'), IPv6 - "aggregate6" by Job Snijders ( https://github.com/job/aggregate6 ) Show Sample Output


    0
    ASN=32934; for IP in 4 6; do whois -h riswhois.ripe.net \!${IP/4/g}as${ASN} | sed -n '2 p' | tr \ \\n | aggregate${IP/4/} | while read NET; do ip${IP/4/}tables -I INPUT -S ${NET} -j REJECT; done; done
    iam_TJ · 2016-05-29 09:45:34 10
  • Block all FaceBook traffic

    I don't know why you would want to echo "blocking ....", but my alternative is functionally equivalent with the extra echo.


    0
    ASN=32934;whois -H -h riswhois.ripe.net -- -F -K -i $ASN|awk '/^'$ASN'/ {if ($2 ~ /::/) {a="6"} else {a=""};b="sudo ip"a"tables -A INPUT -s "$2" -j REJECT"; print " blocking "$2;system(b)}'
    AndrewM · 2016-07-22 07:48:27 14
  • whois multiple domains

    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 7
  • Whois on target and save results to file instantly

    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 9
  • check if commandlinefu.com got a better domain

    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 8

What's this?

commandlinefu.com 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

Check These Out

Using parcellite, indents the content of the clipboard manager
This command takes the content of a Parcellite-managed clipboard manager and add one level of indentation to it. It may be useful to indent a block of code which will enter inside another, already indented one but I use it mostly to indent code I will post in Stack Overflow questions and answers.

Multiple variable assignments from command output in BASH
No command substitution but subshell redirection

Sending a file over icmp with hping
you need to start a listening hping on the reciever: hping3 --listen 10.0.2.254 -I eth0 --sign MSGID1 then you can send your file: hping3 10.0.2.254 --icmp --sign MSGID1 -d 50 -c 1 --file a_file

Generate MD5 of string and output only the hash checksum in a readable format
Generates the md5 hash, without the trailing " -" and with the output "broken" into pairs of hexs.

Extract IPv4 addressess from file

lotto generator

Ease your directory exploration
Usage : tt [OCCURRENCE] tt will display a tree from your actual path tt .svn will display only line containing .svn

move contents of the current directory to the parent directory, then remove current directory.
I think this is less resource consuming than the previous examples

Both view and pipe the file without saving to disk
This is a cool trick to view the contents of the file on /dev/pts/0 (or whatever terminal you're using), and also send the contents of that file to another program by way of an unnamed pipe. All the while, you've not bothered saving any extra data to disk, like you might be tempted to do with sed or grep to filter output.

Produce 10 copies of the same string

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.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

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: