---
- hosts: all
  tasks:
  - name: show IP address
    debug:
      msg: >
        This host uses IP address {{ ansible_facts.default_ipv4.address }}
  - name: show IP address old notation
    debug:
      msg: >
        This host uses IP address {{ ansible_default_ipv4.address }}
  - name: show IP address the fancy way
    debug:
      msg: >
        This host uses IP address {{ ansible_facts['default_ipv4']['address'] }}
  - name: fancy old way
    debug:
      msg: >
        This host uses IP address {{ ansible_default_ipv4['address'] }}