WAN IP Detector for Home Assistant

snippet

January 6, 2026

Add this to Home Assistant configuration.yaml to create a sensor that detects your current WAN IP address.

command_line:
 - sensor:
    unique_id: wan_address
    name: WAN Address
    command: 'wget -O - -q https://icanhazip.com'
    scan_interval: 1800
    icon: mdi:ip

I used this to show my public IP on my dashboard, when I had a dynamic IP that changed every now and then. I also used the below automation to notify my phone (via the Home Assistant companion app) when the IP changes.

alias: Notify when Public IP changes
description: ''
triggers:
 - trigger: state
   entity_id:
    - sensor.wan_address
   not_from:
    - unknown
    - unavailable
   not_to:
    - unknown
    - unavailable
conditions: []
actions:
 - action: notify.mobile_app_ariel_phone
   metadata: {}
   data:
    message: Public IP has changed to {{ states('sensor.wan_address') }}
 - action: notify.persistent_notification
   metadata: {}
   data:
    message: Public IP has changed to {{ states('sensor.wan_address') }}
mode: single