Where Do I Come From

Understanding IP Geolocation Tools and Where Do I Come From

I spent about three years working on infrastructure provisioning for distributed systems, and one of the recurring problems teams hit was figuring out what IP address their services actually resolved to from different vantage points. Not the internal one, the public egress one. That's when I started using tools like Where Do I Come From regularly, and eventually wrote a few scripts that pulled similar data on demand so I wasn't dependent on a browser tab. The site itself is straightforward. You load it, it reads your connection parameters, and returns your public IP, approximate geographic location, ISP, and ASN. That's it. No accounts, no setup. It also runs an API endpoint if you want to query it programmatically. The data comes from a combination of GeoIP databases and BGP routing information, which is standard for this type of service.

Where Do I Come From and what it actually tells you

There's a misconception that IP geolocation pinpoints you precisely. It doesn't. The location data is usually accurate to the city or metropolitan area at best, and sometimes it's wrong entirely. I once had a client whose VPN exit node was in Frankfurt, but the geolocation database still placed the IP in Nuremberg, about 160 kilometers away. Their actual users were in Munich. For security review purposes, this level of inaccuracy is fine. For anything that requires precise routing decisions, it's not reliable enough on its own. What's more useful is the consistency check. When you're investigating a suspicious login or a unexpected traffic pattern, seeing that an IP resolves to a completely different region than your user base is immediately actionable. Where Do I Come From gives you that signal fast. The page loads in under two seconds on a normal connection, and the API responds in roughly 80 to 120 milliseconds depending on your network path to their servers.

How to use it practically

The basic use case is just visiting the site. But the real value comes when you're scripting it. The API returns JSON, which makes it trivial to integrate into monitoring or alerting workflows. Here's how I typically handle it in a Bash script: curl -s https://api.wherecomesfrom.com/v1/ip | jq '.data' This returns structured data with your public IP, the country code, region, city, ISP name, and autonomous system number. I wrapped this in a cron job that runs every six hours on my VPN gateway. If the resolved IP ever changes without a corresponding ticket, the script sends a notification. That's how I caught a misconfigured failover in our disaster recovery setup that was silently routing traffic through a secondary ISP for nearly three weeks.

If you're working in Python, the same request is a single line with requests. The response payload is consistent enough that you don't need heavy parsing logic. I've seen people overcomplicate this with regex when a simple json.loads() call does everything they need.

Common mistakes people make with IP lookup tools

The biggest one is assuming the returned location is your physical location. It isn't. It's the location of your outgoing gateway. If you're on a residential connection, it might be close to your actual address. If you're on a corporate VPN, a cloud proxy, or a CDN edge, it could be anywhere. I learned this the hard way when a vendor audit flagged our office traffic as originating from a data center in Ashburn, Virginia, when our actual office is in London. The traffic was going through a US-based WAF before hitting the internet. The tool was right about the IP, wrong about the person. Another issue is caching. Some of the free tiers on these APIs have rate limits and cached responses. If you're testing from multiple environments in quick succession, you might get stale results. I run a small local cache layer that invalidates after five minutes, which prevents me from hitting the rate limit during extended testing windows.

When this tool isn't sufficient

Where Do I Come From works well for quick checks and basic monitoring. It breaks down when you need forensic-level detail. If you're doing incident response and need to trace a specific request through proxy chains, NAT layers, and CDN hops, this tool won't give you that granularity. You'd need to combine it with traceroute data, WHOIS lookups, and packet captures. I typically start with Where Do I Come From to establish a baseline, then move to more specialized tools like tcpdump or Wireshark if the initial data raises questions. There's also the matter of accuracy drift. GeoIP databases update regularly, but not on a schedule you can rely on for real-time needs. A provider might reassign a block of IPs to a different region, and the tool won't reflect that until the next database refresh. I've seen cases where a ISP renumbered their entire IPv4 pool and the geolocation data was off by country for about two weeks until the major providers updated their records.

Getting started

Head to the main site at wherecomesfrom.com. It's free to use with no registration required. If you need programmatic access, check the API documentation for rate limits and endpoint details. The free tier is generous for personal use, but if you're running this across multiple services in production, you'll probably want to look at their paid plans to avoid throttling during high-volume periods. I run about 50,000 queries per month across my monitoring setup and haven't hit any issues, but that's because I cache aggressively and space out my checks. The tool does exactly what it says it does. It's not a replacement for proper network visibility, but it's a fast, no-fuss way to answer the question you're probably already asking when you land on the page.