Not everything with an IP address is a computer - I found none of these suggestions returned all active IP addresses - in fact most returned very few. My home network has a combination of wired and wireless devices and two routers, mobile phones, TV, PVR, Apple AirPort and probably a few things I have forgotten. I used the following to scan all addresses on the 192.168.1.xxx subnet:
for /L %i in (0,1,255) do ping -n 1 -w 250 192.168.1.%i>>ipaddress.txt
The resulting file ipaddress.txt contains the ping results for all addresses and I looked for those with "Received = 1" - currently 16 addresses returned a result - I only have 4 computers in the house - and they were not all on.
Scanning all IP address on my network
Best IP Scanners for finding devices on a network
Your Favorite one-off Free IP/Network Scanner?
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Not everything with an IP address is a computer - I found none of these suggestions returned all active IP addresses - in fact most returned very few. My home network has a combination of wired and wireless devices and two routers, mobile phones, TV, PVR, Apple AirPort and probably a few things I have forgotten. I used the following to scan all addresses on the 192.168.1.xxx subnet:
for /L %i in (0,1,255) do ping -n 1 -w 250 192.168.1.%i>>ipaddress.txt
The resulting file ipaddress.txt contains the ping results for all addresses and I looked for those with "Received = 1" - currently 16 addresses returned a result - I only have 4 computers in the house - and they were not all on.
You could do the arp -a command to show all ARP entries in the table about computers on your network.
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I have a device with an unknown IP address. I mean I don't even know it's subnet. How do I scan for it? I've tried arp -a and it's giving me the "wrong" info.
Generally, nmap is quite useful to quickly scan networks.
To install nmap, enter the following command in the terminal:
sudo apt-get install nmap
Once the application is installed, enter the following command:
nmap -sn 192.168.1.0/24
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:
nmap -sP 192.168.1.0/24
For additional references, see the following pages:
NMAP Installation Guide
NMAP Reference Guide
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:
sudo arp-scan 192.168.1.0/24
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).
Hi all,
What are everyone’s recommendations for best IP scanners for finding devices on networks? It’s pretty daunting going to a site with no documentation and having to figure out a way to connect to their system, especially if the machine is broken down…
Thanks