nmap seems to work at home but not in my office

[Member kaye]

Hello Friends!

At home, I use nmap all the time to find out the ip address of my Epson Wifi printer (it changes ip address almost every time it is turned on).

I execute “sudo nmap -sn 192.168.1.0/24” and I always get an output similar to this:

Nmap scan report for 192.168.1.1
Host is up (0.0020s latency).
MAC Address: FC:8H:91:39:CF:1F (Shenzhen Gongjin Electronics) 
etc.
etc.
etc.

The ip address of the Epson Wifi printer would be among the list in that output.

In our office however, I would only get this:

Starting Nmap 7.60 ( https://nmap.org ) at 2019-09-07 21:47 PST
Nmap done: 256 IP addresses (0 hosts up) scanned in 206.46 seconds

That’s it. No other lines of output.

The internet connection at home is fiber, office is DSL. If that matters.

I also don’t know if it’s due to the cheap USB wifi adapter that I use in the office (cost about USD8.00).

Thank you for your time!

[Moderator caprea]

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arp-scan is another way to search for the ip-adress via terminal, might worth a try.

sudo apt install arp-scan

sudo arp-scan –localnet

[Member kaye]

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Thank you caprea, arp-scan works great.
I’ve also discovered what I did wrong. Turns out the address of the router is 192.168.XXX.XXX instead of the usual 192.168.X.X , so I just changed the nmap command accordingly, like so:
sudo nmap -sn 192.168.XXX.0/24
Thanks!!!

[Author]

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