Acessing inventory hosts inside playbook

README.md

$ ansible-playbook -i hosts -c local playbook.yml 

PLAY [main[0]] *******************************************************************************************************************************************************************************************************************************

TASK [Gathering Facts] ***********************************************************************************************************************************************************************************************************************
ok: [127.0.0.1]

TASK [debug] *********************************************************************************************************************************************************************************************************************************
ok: [127.0.0.1] => {
    "msg": "192.168.0.53"
}

PLAY RECAP ***********************************************************************************************************************************************************************************************************************************
127.0.0.1                  : ok=2    changed=0    unreachable=0    failed=0   

hosts

[main]
127.0.0.1
192.168.0.53

playbook.yml

- hosts: main[0]
  tasks:   
    - debug: 
        msg: "{{ groups['main'][1] }}"