Commands using netstat (131)
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We use the "convert" command (ImageMagick package) : see man convert (http://www.ma.utexas.edu/cgi-bin/man-cgi?convert+1)
0netstat -rn | convert label:@- netstat.png -
This is also perl-less, and only uses AWK as its postprocessor. Tested with GAWK and MAWK.
0netstat -tan | awk '$1 == "tcp" && $4 ~ /:/ { port=$4; sub(/^[^:]+:/, "", port); used[int(port)] = 1; } END { for (p = 32768; p <= 61000; ++p) if (! (p in used)) { print p; exit(0); }; exit(1); }' -
See who is using a specific port. Especially when you're using AIX. In Ubuntu, for example, this can easily be seen with the netstat command. Show Sample Output
0netstat -Aan | grep .80 | grep -v 127.0.0.1 | grep EST | awk '{print $6}' | cut -d "." -f1,2,3,4 | sort | uniq -
Show state of NAT, readed from '/proc/net/ip_conntrack' or '/proc/net/nf_conntrack' Show Sample Output
0netstat-nat -n -
cut -f1,2 - IP range 16 cut -f1,2,3 - IP range 24 cut -f1,2,3,4 - IP range 24 Show Sample Output
0netstat -tn | grep :80 | awk '{print $5}'| grep -v ':80' | cut -f1 -d: |cut -f1,2,3 -d. | sort | uniq -c| sort -n -
Count on a specific port (80) - FreeBSD friendly. Show Sample Output
0netstat -an | grep 80 | wc -l -
0netstat -antu | awk '$5 ~ /[0-9]:/{split($5, a, ":"); ips[a[1]]++} END {for (ip in ips) print ips[ip], ip | "sort -k1 -nr"}'
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0netstat -tuapen | grep LISTEN
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I used this to get all the remote connection ip addresses connected to my server... I had to start storing and tracking this data so thats why i built this out... probably not optimal as far as the egrep regex but it works ;) Show Sample Output
0netstat -tn | awk '{print $5}' | egrep -v '(localhost|\*\:\*|Address|and|servers|fff|127\.0\.0)' | sed 's/:[0-99999999].*//g' -
This has saved me many times while debugging timeout issues to "too many open files" issues. A high number of the order of thousand, indicates that somewhere connection is not being closed properly. Show Sample Output
0while true; do netstat -a|grep WAIT|wc -l; sleep 5; done -
bit of a contrived example and playing to my OCD but nice for quick scripted output of listening ports which is sorted by port, ip address and protocol. Show Sample Output
0sudo netstat -plntu --inet | sort -t: -k2,2n | sort --stable -t. -k 1,1n -k 2,2n -k 3,3n -k 4,4n | sort -s -t" " -k1,1 -
Should work with sh, bash, etc. Show Sample Output
0port=32768; while netstat -atn | grep -q :$port; do port=$(expr $port + 1); done; echo $port -
netstat will list all open ports on the system, unix sockets, tcp sockets and udp sockets. the t flag limits to tcp ports the l flag limits to listening ports and the n flag disables the translation of port to service ( ie :25 displayed instead of :smtp ). then grep for the port you are interested in preceeded by a colon. Show Sample Output
0netstat -tln | grep :25 -
0netstat -np --inet|awk '/firefox/{split($5,a,":");z[a[1]]++} END{for(i in z){system("whois " i)}}'|less
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-t TCP -u UDP -n NO DNS resolution or PORT/SERVICE resolution -l state -a ? -p PORT show -o flag (keepalive, off, etc)
0netstat -tunlapo -
Show If Someone Is Connected To The Android Device On And Get Their IP Address
0netstat -lptu | grep -E "22.*ESTABLISHED" | cut -s -d ':' -f2 | awk '{print $2}' -
0netstat -anp | grep ":<port>"
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0netstat -nr|egrep -v "Routing|Interface|lo0"|awk '{print $5}'|sort -u| while read l; do ifconfig $l ; echo " Station Addr: `lanscan -ia|grep "$l "|cut -d ' ' -f 1`" ; done
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0sudo netstat -tulpn | grep :8080
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0netstat -anop tcp | find ":8010"
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0netstat -tapn|grep LISTEN
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0netstat -npt
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Using netstat & find together, found this while on stackoverflow s few minutes ago and really like it due to the simplicity and so far it's the most concise. Show Sample Output
0netstat | find "ESTABLISHED" -
Useful to see what ports are taken by running services. Show Sample Output
0netstat -ltn | awk -n '/tcp /{ split($4, x, ":"); print(x[2]); }' | sort -n -
Check the connection of the maximum number of IP Show Sample Output
0netstat -na | grep ESTABLISHED | awk '{print$5}' | awk -F : '{print$1}' | sort | uniq -c | sort -r - ‹ First < 2 3 4 5 6 >
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