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Is there an nmap line that will auto-detect my current IP address and subnet mask, and run a ping-scan on all? For example:

#> nmap -sP 0.0.0.0

Instead of manually:

#> nmap -sP 192.168.100.0/24
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up vote 4 down vote accepted

I don't think that there is a way with doing that with nmap alone, but you could script it: Here is a quick and dirty solution:

#!/bin/bash

IP_AND_MASK=`ifconfig | grep "inet addr" | head -n1 | sed 's|.*addr:\([0-9\.]*\).*Mask:\([0-9\.]*\)|\1/\2|g'`
NETWORK=`ipcalc "$IP_AND_MASK" | grep "Network:" | sed 's|^Network:\s*\([0-9/\.]*\).*|\1|g'`
nmap -sP "$NETWORK"

You have to install ipcalc to make that solution work.

hth

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This works, but then you still need to know your own subnet... saves copy-pasting the IP address though.

nmap -sP /24
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On my system (OS X 10.10, nmap version 6.47) this doesn’t work for me. I get the following error: ::1/0 looks like an IPv6 target specification -- you have to use the -6 option.. – Daniel Griscom Jan 25 '15 at 21:13

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