nmap seems to work at home but not in my office

Forum Forums General Software nmap seems to work at home but not in my office

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  • This topic has 2 replies, 2 voices, and was last updated Sep 11-6:11 am by kaye.
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  • #26849
    Member
    Avatarkaye

    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!

    #26871
    Member
    capreacaprea

    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

    #26987
    Member
    Avatarkaye

    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!!!

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