Ifconfig.co – Hacker-friendly “What is my IP address”

It's great to have services like this.

For the benefit of anyone interested: for a "self-hosted" solution, you can do this entirely within Nginx. Here's an example config:

    server {
      listen 80 default_server;
      listen [::]:80 default_server;

      listen 443 default_server;
      listen [::]:443 default_server;

      # Use Letsencrypt for SSL. This part will depend on your own setup.
      ssl_certificate /etc/letsencrypt/live/<my domain>/fullchain.pem;
      ssl_certificate_key /etc/letsencrypt/live/<my domain>/privkey.pem;

      server_name <my domain>;

      # Deny all access at all paths; useful if you're hosting other stuff behind
      # the same Nginx server (e.g. reverse proxy)
      location / {
        deny all;
      }

      # At /ip, return 200 with the client IP address in the body
      location = /ip {
        default_type text/plain;
        return 200 '$remote_addr';
      }
    }

Along the same lines, if you want to make your own AWS Lambda /API Gateway version of this:

    def lambda_handler(event, context):
        return {
            'statusCode': '200',
            'headers': None,
            'body': event.get('requestContext', {}).get('identity', {}).get('sourceIp', 'unknown')
        }

I do this, though my lambda is a bit more complex in practice, since I have some triggers that say "if this thing reports a new IP, do something".

Of course, AWS provides this basic service as checkip.amazonaws.com