Linux scan local network

How Do I Scan A Local Network In Linux

A. Using Linux command to find devices on the network Step 1: Install nmap. nmap is one of the most popular network scanning tool in Linux. Step 2: Get IP range of the network. Now we need to know the IP address range of the network. Step 3: Scan to find devices connected to your network.

How do I scan a local IP address in Linux?

Try following steps: Type ipconfig (or ifconfig on Linux) at command prompt. This will give you the IP address of your own machine. Ping your broadcast IP address ping 192.168. 1.255 (may require -b on Linux) Now type arp -a . You will get the list of all IP addresses on your segment.

How can I see all devices on my local network?

To see all of the devices connected to your network, type arp -a in a Command Prompt window. This will show you the allocated IP addresses and the MAC addresses of all connected devices.

What is my local network IP Linux?

You can determine the IP address or addresses of your Linux system by using the hostname , ifconfig , or ip commands. To display the IP addresses using the hostname command, use the -I option. In this example the IP address is 192.168. To view IP addresses, use ip addr show .

How do I find my local IP?

How do I find my Internal/Local IP address? Click on the start menu. Type cmd and press enter. In this new windows type ipconfig and press enter. You will see a bit more information than you may want what your looking for is IPv4 Address. The number across from that is your local IP address.

What is ipconfig in Linux?

ipconfig stands for Internet Protocol Configuration. This command is used to view all the current TCP/IP network configurations values of the computer. The ipconfig command is mainly used in Microsoft Windows operating system. Some of the latest versions of the Linux OS also supports ipconfig.

How do I identify an unknown device on my network?

Tap the Settings app. Tap About Phone or About Device. Tap Status or Hardware Information. Scroll down to see your Wi-Fi MAC address. Open the Home Network Security app. Tap the Menu icon. Tap Devices, select the device, look for the MAC ID. Check if it matches any of your devices’ MAC addresses.

Who is connected to my network?

You’ll now need to look for the option in your router’s web interface somewhere. Look for a link or button named something like “attached devices,” “connected devices,” or “DHCP clients.” You may find this on the Wi-Fi configuration page, or you may find it on some sort of status page.

How can I find the IP address of a device on my network?

The most basic way to find all the IP addresses on a network is with a manual network scan.How to Find All IP Addresses on a Network Open the command prompt. Enter the command “ipconfig” for Mac or “ifconfig” on Linux. Next, input the command “arp -a”. Optional: Input the command “ping -t”.

How do I use ifconfig in Linux?

To assign an IP address to a specific interface, use the following command with an interface name (eth0) and ip address that you want to set. For example, “ifconfig eth0 172.16. 25.125” will set the IP address to interface eth0.

How do I use nslookup in Linux?

nslookup command in Linux with Examples nslookup google.com : nslookup 192.168.0.10 : Reverse DNS lookup. nslookup -type=any google.com : Lookup for any record. nslookup -type=soa redhat.com : Lookup for an soa record. nslookup -type=ns google.com : Lookup for an ns record.

How do I set a static IP in Linux terminal?

How to Manually Set Your IP in Linux (including ip/netplan) Set Your IP Address. ifconfig eth0 192.168.1.5 netmask 255.255.255.0 up. Masscan Examples: From Installation to Everyday Use. Set Your Default Gateway. route add default gw 192.168.1.1. Set Your DNS Server. Yes, 1.1. 1.1 is a real DNS resolver by CloudFlare.

What is a 192.168 IP address?

The IP address 192.168. 0.1 is one of 17.9 million private addresses, and it’s used as the default router IP address for certain routers, including some models from Cisco, D-Link, LevelOne, Linksys, and many others.

What is LAN IP address?

LAN means Local Area Network. Furthermore, this would be the network inside your home or business that connects your shared resources and Internet connection. Therefore, the most common LAN IP address configurations are in the 192.168. xxx. To clarify, they would be called your Internal IP addresses.

What is my local port?

All you have to do is type “netstat -a” on Command Prompt and hit the Enter button. This will populate a list of your active TCP connections. The port numbers will be shown after the IP address and the two are separated by a colon.

How do I enable Internet on Linux?

Connect to a wireless network Open the system menu from the right side of the top bar. Select Wi-Fi Not Connected. Click Select Network. Click the name of the network you want, then click Connect. If the network is protected by a password (encryption key), enter the password when prompted and click Connect.

Is ipconfig a Linux command?

The ifconfig command is used to get the information of active network-interfaces in a UNIX-like operating system such as Linux, whereas ipconfig is used in the Windows OS.

How do I use ipconfig in Linux?

ifconfig(interface configuration) command is used to configure the kernel-resident network interfaces. It is used at the boot time to set up the interfaces as necessary. After that, it is usually used when needed during debugging or when you need system tuning.

Why is there an unknown device on my network?

If you see strange devices on your network manager, it is likely that your Wi-Fi is protected using a WPA (Wi-Fi Protected Access) protocol. If the device has an IP address then it is connected to your Wi-Fi successfully. Windows Connect Now on Windows 10 and 8 goes and does some further work.

Can I see what others are doing on my network?

WireShark Wireshark is a popular packet capturing tool, design especially to see what people are browsing on a network in real-time. Once you start the software, it shows the IP address of all the devices on your network. Simply select the one – you want to monitor and launch the packet capture session. And that’s it.

How do I check my Wi-Fi connection?

First right-click on the Wi-Fi icon at the lower right corner area of the screen, then click on Open Network and Sharing Center. Next, click on the Wi-Fi connection, which will open up the status window that shows you the current connection speed among other things.

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How to find all the used IP addresses on a network

In my work there is a lot of computer and I want make a joke. I can close computer over the network but finding IP addresses is hard to me. How can I easily find all online IP adresses from 192.168.1.aa to 192.168.1.zz?

5 Answers 5

Generally, nmap is quite useful to quickly scan networks.

To install nmap, enter the following command in the terminal:

Once the application is installed, enter the following command:

This will show you which hosts responded to ping requests on the network between 192.168.1.0 and 192.168.1.255.

For older versions of Nmap, use -sP :

For additional references, see the following pages:

It is a very useful tool to learn.

If all the computers in your network are Ubuntu or any other distribution that makes use of avahi-daemon (DNS-SD), you can get a detailed list of them (with hostname and IP address) by doing:

avahi-browse -rt _workstation._tcp 

If you want to know all the IP addresses used in your network, you can use arp-scan :

As it is not installed by default, you’ll have to install it with sudo apt-get install arp-scan . arp-scan send ARP packets to the local network and displays the responses received, so it shows even firewalled hosts (that block traffic based on IP packets).

This command is definitely better than the one above. Running nmap took ages, but this one replied instantly with the nodes in the specified network.

In my case, very often, arp-scan doesn’t find all the devices associated to my wireless network. Now, for example, sudo arp-scan 192.168.2.0/24 shows 2 results (.1 and .1), while nmap -sn 192.168.2.0/24 shows 4 results (.1, .2, .3 and .4). So, it seems that nmap is more accurate (I know for sure that there is 4 devices attached to the network). Why is this?

Maybe I found the answer in a comment to another question. «It should be noted that some devices might not show up unless they are turned on. My nexus 4 won’t show up unless the screen is on.» However, it’s interesting that the same devices always respond to pings from nmap .

Note to the reader: Original answer has been posted a while ago and at the time of when I was only learning shell scripting. See the revisited version below for a new and improved script that performs much faster.

Original Answer

nmap would be my #1 choice, but what if you don’t have it ? The DIY way would be with a ping script that goes through each possible ip address on the network manually. What we have here is just while loop, where we set last number in the address, make silent single ping to the address, check if the command succeed or not (and if it did succeed,then host is obviously up ), and printf statement. Quick and dirty way, took me about 10 mins to write it, but runtime might be a bit slow,though.

#!/bin/sh # set -x NUM=1 while [ $NUM -lt 256 ];do ping -q -c 1 192.168.0.$NUM > /dev/null RESULT=$(echo $?) if [ $RESULT -eq 0 ]; then printf 192.168.0.$NUM"\n" fi NUM=$(expr $NUM + 1) done 

Revisited Answer

I originally posted this answer in August of 2015. Since then I’ve learned a bit more about shell scripting, and I once I saw this script, I thought it would be a good idea to revisit this answer to add a few improvements. Here’s a few ideas:

• The script is obviously slow and ping waits for response from the host. By default, ping for two RTT, which can vary depending on how congested is your network , and as far as I understand TCP protocol doubles the wait time each time(at least according to this). So we could force ping to time out with -w 1 flag. Since we have 256 addresses and we assume 1 second for each address, the script will take about 256/60 = 4.27 minutes.
• Doing a command and then capturing its exit status with $? wasn’t really necessary. The if . then;. fi can operate on commands directly. In other words, it’s sufficient to do this:

if ping -w 1 -q -c 1 192.168.0.$NUM > /dev/null ; then fi 

printf "IP %s is up\n" 192.168.0."$NUM" 

#!/bin/sh # Uncomment for debugging #set -x pingf() < if ping -w 2 -q -c 1 192.168.0."$1" >/dev/null ; then printf "IP %s is up\n" 192.168.0."$1" fi > main() < NUM=1 while [ $NUM -lt 255 ];do pingf "$NUM" & NUM=$(expr "$NUM" + 1) done wait >main 

How much better does that work ? Not bad, actually, takes a matter of seconds.

$ time ./ping_script.sh IP 192.168.0.1 is up IP 192.168.0.101 is up IP 192.168.0.27 is up IP 192.168.0.29 is up 0m02.50s real 0m00.01s user 0m00.12s system 

Things to Keep in Mind

• Windows ( starting since Windows 7 , I think ) have started blocking response to ICMP echo requests. There’s quite a few questions about that on Ask Ubuntu and other sites of the sort «Hey, my Linux computer can be pinged, but not Windows ones, what’s up with that ?» Just be aware of the fact that for newer Windows versions you do need to enable response to ICMP echo.

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