How to generate random IP addresses

Question

How to generate random IP addresses

$ nmap -n -iR 0 -sL > RANDOM-IPS-TMP.txt

$ grep -o "[0-9]\.[0-9]*\.[0-9]*\.[0-9]*" RANDOM-IPS-TMP.txt |

      egrep -v "10.*|172.[16-32].*|192.168.*|[224-255]." > RANDOM-IPS.txt

egrep: Invalid range end

$

How can I generate random IP Addresses outside the private IP address range and the multicast IP Address range?

random ip shell

3 years ago by Amit8z4mc

1 Answer

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**Bharatgxwzm** · Answer 1 · 2021-10-16T11:02:22

This shell snippet generates an IP address.

ip_address=$(dd if=/dev/urandom bs=4 count=1 2>/dev/null |

             od -An -tu1 |

             sed -e 's/^ //' -e 's/  /./g')

If you're not happy with it, try again in a loop.

while

  set $(dd if=/dev/urandom bs=4 count=1 2>/dev/null | od -An -tu1)

  [ $1 -lt 224 ] &&

  [ $1 -ne 10 ] &&

  { [ $1 -ne 192 ] || [ $2 -ne 168 ]; } &&

  { [ $1 -ne 172 ] || [ $2 -lt 16 ] || [ $2 -gt 31 ]; }

do :; done

ip_address=$1.$2.$3.$4

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How to generate random IP addresses

1 Answer

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