The examples in the blog post are in PHP and I'm not sure how they translate to the Node SDK. I would guess that a track event with an IP address would look like this: ...

An IP address which stands for internet protocol address is a digital code that is generated through a hierarchical system that involves the RIRs, IANA, and ISPs which allows computers to send and ...

This IP address API returns useful meta-information for IP addresses. For example, the API response includes the organization of the IP address, ASN information and geolocation intelligence and WHOIS ...

The internet relies on a system of addresses that treats every computer, tablet and smartphone as a distinct device, allowing all of them to communicate with each other. Because many kinds of devices ...