Commands using netstat (131)
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Check open TCP and UDP ports Show Sample Output
1netstat -plntu -
Lists all opened sockets (not only listeners), no DNS resolution (so it's fast), the process id and the user holding the socket. Previous samples were limiting to TCP too, this also lists UDP listeners. Show Sample Output
1netstat -anpe -
Easy to remenber. Fot TCP only use: netstat -plant Show Sample Output
1netstat -plantu -
if you don't do --numeric-ports, netstat will try to resolve them to names Show Sample Output
1netstat -a --numeric-ports | grep 8321 -
1netstat -tn | awk '($4 ~ /:22\s*/) && ($6 ~ /^EST/) {print substr($5, 0, index($5,":"))}'
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1netstat -tulpn
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Same as the rest, but handle IPv6 short IPs. Also, sort in the order that you're probably looking for. Show Sample Output
1netstat -ntu | awk ' $5 ~ /^(::ffff:|[0-9|])/ { gsub("::ffff:","",$5); print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr -
This command show listening sockets TCP and UDP. Useful for stop unwanted services from linux. Show Sample Output
1netstat -t -u -l -
1netstat -tn 2>/dev/null | grep :80 | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr | head
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0netstat -tap | grep mysql
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0netstat -antuwp | egrep "(^[^t])|(^tcp.*LISTEN)"
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0netstat -anp --tcp --udp | grep LISTEN
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Works only on Linux. Last option (n) turn name of service resolving (/etc/services) off. Show Sample Output
0netstat -ltun -
0netstat -in
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0netstat -tlvp
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perl-based version
0netstat -atn | perl -ane 'if ( $F[3] =~ /(\d+)$/ ) { $x{$1}=1 } END{ print( (grep {!$x{$_}} 32768..61000)[0] . "\n" )}' -
shows opened ports on machine in continuous mode (refreshing every 10 sec) Show Sample Output
0netstat -tulpnc -
I cannot run Tomcat from Eclipse. It says that there?s other process that is running on port 8080, but I don?t know what is the process, and how to stop it from the Services manger in Windows. So here?s how you can kill and find out what is that process: To find out what PID 8080 was (hopefully not a trojan) I typed tasklist /FI ?PID eq 8080″ taskkill /F /PID 2600
0netstat -a -o -n | grep 8080 -
0netstat -lnptu
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0netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
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0watch -n 2 netstat -antu
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count connections, group by IP and port
0netstat -nt | awk -F":" '{print $2}' | sort | uniq -c -
0netstat -nut | sed '/ESTABLISHED/!d;s/.*[\t ]\+\(.*\):.*/\1/' | sort -u
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Count and Find all IP connected to my host through TCP connection. Show Sample Output
0netstat -an |grep ":80" |awk '{print $5}' | sed s/::ffff://g | cut -d: -f1 |sort |uniq -c |sort -n | tail -1000 | grep -v "0.0.0.0" -
0sudo netstat|head -n2|tail -n1 && sudo netstat -a|grep udp && echo && sudo netstat|head -n2|tail -n1 && sudo netstat -a|grep tcp
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