Linux Bash Script To List All Connected IPs and their network name

 for ip in `netstat -nt|awk '{ print $5 }'|cut -d ":" -f 1|tail -n +3|sort|uniq`; do

     echo $ip;whois $ip|grep -i netname;echo "---------------------------" 

  done

 


77.88.47.40
netname:        YANDEX-77-88-47
---------------------------
40.77.167.5
---------------------------
180.76.15.143
netname:        Baidu
---------------------------
77.88.47.40
netname:        YANDEX-77-88-47
---------------------------
5.255.250.113
netname:        YANDEX-5-255-250
---------------------------
77.88.47.40
netname:        YANDEX-77-88-47
---------------------------
180.76.15.156
netname:        Baidu
---------------------------
77.88.47.40
netname:        YANDEX-77-88-47
---------------------------
207.46.13.111
---------------------------
77.88.47.40
netname:        YANDEX-77-88-47
---------------------------
 

Revised More Efficient/Better Version:

I like this version better becaues it uses the same data from netstat because even a few seconds later the table may have changed and the connection will no longer be visible.  This way is also quicker and more efficient since there are no more multiple calls to the netstat binary.

rawoutput=`netstat -nt`
ipoutput=`echo "$rawoutput"|awk '{ print $5 }'|cut -d ":" -f 1|tail -n +3|sort|uniq`

 for ip in $ipoutput; do
     echo $ip;
     sourceconn=`echo "$rawoutput"|grep -i $ip|awk '{print $4}'|sort|uniq`
     whois=`whois $ip|grep -Ei "netname|range:|route:|cidr:"`
     if [ -z "$whois" ]; then
         whois=`whois $ip|grep -vE "^$|^#|^$|^\["`
     fi

     echo -e "$whois\n$sourceconn\n---------------------------"
  done

 

More Advanced/Slower Version

The above version doesn't always capture the name of the network, here is a more advanced script that is more inclusive and also shows the IP ranges associated with the IP and also the IPs and ports it is actually connected to.

 

 for ip in `netstat -nt|awk '{ print $5 }'|cut -d ":" -f 1|tail -n +3|sort|uniq`; do
     echo $ip;
     sourceconn=`netstat -nt|grep -i $ip|awk '{print $4}'|sort|uniq`
     whois=`whois $ip|grep -Ei "netname|range:|route:|cidr:"`
     if [ -z "$whois" ]; then
         whois=`whois $ip|grep -vE "^$|^#|^$|^\["`
     fi

     echo -e "$whois\n$sourceconn\n---------------------------"
  done

 

 

58.242.83.36
netname:        HUAIBEIBASIP
route:          58.242.0.0/15
route:          58.242.0.0/15
192.168.1.236:22
---------------------------
198.255.100.58
FDCservers.net FDCSERVERS (NET-198-255-0-0-1) 198.255.0.0 - 198.255.127.255
FDCservers.net FDCSERVERS-DENVERENT (NET-198-255-100-0-1) 198.255.100.0 - 198.255.101.255
192.168.1.102:80
192.168.1.189:80
192.168.1.236:80
192.168.1.61:80
---------------------------
185.71.66.10
netname:        StormWall-net
route:          185.71.66.0/24
192.168.1.102:80
192.168.1.189:80
192.168.1.236:80
192.168.1.61:80
--------------------------- 

 


Tags:

linux, bash, ips, ip, netstat, nt, awk, quot, uniq, echo, whois, grep, netname, yandex, baidu,

Latest Articles

  • Linux qemu-kvm How To Enable Soundcard in Guestl
  • QEMU-KVM Windows and Server Guest Installs Mouse Tracking Pointer Location Solution
  • SSH Keep Alive To stop Disconnections
  • Linux How To Disable SATA NCQ For Better Performance
  • the sign-in method you're trying to use isn't allowed. For more info, contact your network administrator - solution for active directory
  • gsmartcontrol for Windows to Check the SMART S.M.A.R.T status
  • WebRTC Vulnerability Shows Local IP Address Even When Using a Proxy or VPN Firefox Fix And Disable Solution
  • chroot in Linux Howto Simple and Easy Guide
  • qemu-kvm qemu-system Image format was not specified for '/mnt/space/cucm12.img' and probing guessed raw. Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted. Specify the 'ra
  • Linux Over VNC VMWare How To Switch Virtual Terminals Console Without Using Ctrl+Alt+F1
  • Skype For Business 2015 and 2019 Guide, Reference, Howto and Troubleshooting Solutions
  • Centos 6 or 7 no DHCP IP during startup on first boot or reboot solution
  • Debian / Mint / Ubuntu net-tools packages provides netstat, ifconfig, route, arp and other classic network admin tools
  • Linux Mint XWindows Ubuntu MATE or Cinnamon How To Restart The GUI / Graphics / Session if it freezes without losing current windows or programs
  • Linux bash prompt why does it not show username@host and the current directory?
  • Microsoft SQL Server Check What Version is Running
  • How to install and setup LXC Containers (OpenVZ alternative) on Centos 6 / 7
  • Cisco CUCM Unified Communication Manager Howto Guide and Tutorials
  • SSH persistent and automatic login script for proxy
  • SSH proxy/command in the background or from cron script