There are two similar but distinct "ipaddr" modules.

• ansible.netcommon.ipaddr
• ansible.utils.ipaddr

ansible.netcommon.ipaddr is being deprecated, so you should almost always use ansible.utils.ipaddr.

[DEPRECATION WARNING]: 
Use 'ansible.utils.ipaddr' module instead. 
This feature will be removed from ansible.netcommon in a release after 2024-01-01.

You may need to install the ansible.utils collections.

ansible-galaxy collection install ansible.utils

ansible.utils.ipaddr('network') can be used to determine the network address using an IP address in a subnet. For example, in 10.0.0.0/24

• the network address is 10.0.0.0/24
• the first available IP address is 10.0.0.1
• the last available IP address is 10.0.0.254
• the broadcast address is 10.0.0.255/24

---
- hosts: localhost
  tasks:
  - name: using '10.0.0.123/24', return network address
    debug:
      msg: "{{ '10.0.0.123/24' | ansible.utils.ipaddr('network') }}"

  - name: using '10.0.0.123/24', return broadcast address
    debug:
      msg: "{{ '10.0.0.123/24' | ansible.utils.ipaddr('broadcast') }}"
...

Running this playbook should return the following.

TASK [using '10.80.168.5/24', return network address] 
ok: [localhost] => {
    "msg": "10.80.168.0"
}

TASK [using '10.80.168.5/24', return broadcast address] 
ok: [localhost] => {
    "msg": "10.80.168.255"
}