From an old-style fact module back to a new one, this module can be used to gather information on the physical network interfaces on your VMware ESXi hosts:

- name: Find out facts about the vmnics on all the ESXi hosts
  vmware_host_vmnic_facts:
    hostname: "{{ vsphere_host }}"
    username: "{{ vsphere_username }}"
    password: "{{ vsphere_password }}"
    validate_certs: "no"
    datacenter: "my_datacenter"
  register: cluster_vmnics

For a single ESXi host, we could use the following task:

- name: Find out facts about the vmnics on a single ESXi host
  vmware_host_vmnic_facts:
    hostname: "{{ vsphere_host }}"
    username: "{{ vsphere_username }}"
    password: "{{ vsphere_password }}"
    validate_certs: "no"
    esxi_hostname: "{{ exsi_host }}"
  register: host_vmnics