Ansible looking up if IP address used [ Edited ]

[#1]

Working on a playbook to find one free IP address with nios_next_ip  and then use the same address with second octet different in a DR range.

What would be the way to do this? Dont see a similar lookup mentioned.

[#2]

Didn't work out well, the next ip only allows to return up to 20 addresses.

Went with a regular lookup of a network and then filter on UNUSED, that returns everything which isn't used.

Comparing the last octet of that list with a list of the other network and doing an intersect in Ansible gets me a list of usable IPs, well the 4th octect which i can use to create the actual IPs.