ansible - example of extracting all ipaddresses in the range 192.168.0.0/24 for hosts matching pattern

play.yml

---
- hosts: "{{ pattern }}"
  gather_facts: True
  tasks:
    - name: combine all ipv4
      set_fact: 
        all_ipv4: "{{ all_ipv4 + ansible_all_ipv4_addresses }}"
        
    - name: reduce to matching ip's
      set_fact:
        matching_ipv4s: "{{ all_ipv4 | ipaddr('192.168.0.0/24') | unique }}"
        
    - name: output
      debug:
        var: matching_ipv4s