A complete guide to how the Check My IP Address tool works, why it was built the way it was, and what its results actually mean.
Launch the Check My IP Address tool →The Check My IP Address tool is one of the simplest utilities on NexTechTools, but it answers a question that comes up constantly in both everyday life and professional IT work: what public IP address is this device currently using to reach the internet, and what can be inferred about that address's approximate location and network provider? When you load the page, it automatically queries a third-party geolocation service and displays your current public IPv4 or IPv6 address, along with a geolocation panel showing city, region, country, postal code, timezone, and ISP/organization information.
This is deliberately a one-click, zero-configuration tool. There is no form to fill out and no settings to adjust before you get a result — the lookup fires automatically the moment the page finishes loading, and a Refresh button is provided in case your connection changes (for example, if you reconnect to a VPN or switch Wi-Fi networks) and you want an updated reading without reloading the whole page.
A copy-to-clipboard icon sits next to the IP address display, since one of the most common reasons people look up their own public IP is to immediately paste it somewhere else — into a firewall allow-list, a remote desktop connection, a support ticket, or a router's port-forwarding configuration.
Despite looking like a single, simple action, this tool depends entirely on a third-party geolocation API, because a web page cannot determine its own visitor's public IP address using JavaScript alone. JavaScript running in your browser only has access to information the browser chooses to expose, and your public-facing IP address (the one visible to the rest of the internet) is assigned by your ISP or network at the point where your traffic leaves your local network — it is not something client-side code can introspect directly.
To get around this, the tool makes an outbound HTTPS request to ipwho.is, a free, keyless geolocation API. When your browser sends that request, the ipwho.is server sees the request arriving from your actual public IP address (the same way any web server does for any visitor), looks that address up in its own internal IP-to-location mapping database, and sends the result back as a JSON object. The page then parses that JSON and displays the fields in the layout you see.
This is the only architecturally possible way to build a "what is my IP" tool without a backend server of your own: some external service has to be the one to observe the request and report back what it saw. This is also why the tool's footer explicitly discloses that it queries a third-party service, rather than claiming everything happens "locally" the way some of the other tools on this site can honestly claim.
Suppose your home internet connection is provided by a regional ISP in Texas. When you load this tool, ipwho.is might return something like IP: 71.42.xxx.xx, City: Bryan, Region: Texas, ISP: Suddenlink Communications. None of that data was stored anywhere by NexTechTools — it was generated fresh by ipwho.is at the moment of your request and displayed directly in your browser.
A home user setting up port forwarding on their router for a game server or a self-hosted application often needs to know their current public IP address to test the connection from outside their network, or to compare it against what a dynamic DNS service has recorded. This tool provides that answer in one click, without needing to log into the router itself or search for "what is my IP" on a search engine that may show ads or unrelated content around the result.
Early in this tool's development, a reasonable question came up: why not use a well-known commercial provider like MaxMind, which is often considered an industry benchmark for IP geolocation accuracy? The answer comes down to a hard architectural constraint of this entire site: every tool on NexTechTools is 100% static HTML, CSS, and JavaScript with no backend server. That constraint rules out several otherwise-attractive options.
MaxMind's GeoLite2 web service does offer a free tier, but it requires creating an account and authenticating every API call with an account ID and license key sent via HTTP Basic Authentication. In a server-side application, those credentials stay hidden on the server. In a purely client-side page like this one, there is no server to hide them on — any key embedded in the page's JavaScript is visible to anyone who opens their browser's developer tools and inspects the network requests or source code. Shipping a tool that silently leaks an API credential to every visitor is not an acceptable trade-off, so MaxMind was ruled out specifically because of this architecture, not because of any quality concern with their data.
A second commercial-feeling option, ipapi.co, was also evaluated. A live test confirmed it actually returns rich, well-formatted JSON data, but a documented browser test (found during research into this exact problem) showed that ipapi.co does not send an Access-Control-Allow-Origin header, meaning the browser's CORS security policy blocks JavaScript from reading the response even though the request technically succeeds. On top of that, ipapi.co's own pricing documentation explicitly labels its free tier as a trial, intended for testing and development rather than production use. Both of those facts together made it unsuitable for a tool meant to work reliably for real visitors.
ipwho.is was selected because it satisfies every requirement simultaneously: it requires no API key or account of any kind, it has been confirmed in live browser testing to send the correct CORS headers so JavaScript can actually read its response, and its free tier has no documented production-use restriction. Later, a second provider, FreeIPAPI (specifically its free.freeipapi.com endpoint), was also confirmed working in a real browser console test and added as a second option in a dropdown, specifically so users could compare results from two independent sources side by side.
That dropdown exists because of a direct observation: a user comparing this tool's output against MaxMind's own public lookup tool noticed the two services reported different cities for the same IP address. That is not a bug in either tool. Different geolocation providers maintain entirely separate internal databases built from different source material — WHOIS registry records, ISP-provided address block assignments, network routing analysis, and in some cases crowdsourced or inferred data. There is no single global authoritative source that maps every IP address to a location; each provider's answer is their own best estimate. A small information icon next to the source dropdown explains this directly to users, rather than letting them assume one tool is simply "wrong."
It's worth being direct about the real-world accuracy limits of IP geolocation in general, since this affects every tool of this kind, not just this one. Country-level accuracy across the industry is typically very high, often cited above 99%, because large blocks of IP addresses are allocated to regional internet registries and ISPs on a country-by-country basis, and that allocation data is well documented and publicly available.
Accuracy drops noticeably at finer resolutions. State or regional accuracy commonly runs somewhere in the 55–80% range depending on the provider and region, and city-level accuracy can be as low as 20% or as high as roughly 75%, again depending heavily on the specific provider and the specific geographic area. Even MaxMind's own published accuracy documentation states that their city-level estimate for United States addresses is correct within 50 kilometers only about 66% of the time. In other words, even the most carefully maintained commercial databases do not claim pinpoint city-level accuracy, and treating any IP geolocation result as a precise location is a mistake regardless of which provider produced it.
Several real-world factors make geolocation results drift further from a user's literal physical location: carrier-grade NAT (common on mobile data connections, where many customers share a small pool of public IP addresses), VPN or proxy usage, and the simple fact that geolocation databases often resolve an address to an ISP's regional headquarters or routing hub rather than the actual household or office using that address. None of this makes the tool "broken" — it is working exactly as designed and faithfully reporting what the chosen provider's database says, which is the most any client-side geolocation tool can honestly promise.
No information displayed by this tool is logged, stored, or transmitted anywhere by NexTechTools itself. The only network request involved is the direct call from your browser to the geolocation provider (ipwho.is or FreeIPAPI, depending on which you select), and that request is identical in nature to the request your browser makes every time you visit any website — the destination server simply sees the IP address your traffic is coming from, which is unavoidable for literally any internet communication.
Closing the browser tab or navigating away discards everything the page was displaying. There is no account, no cookie-based tracking of your IP history, and no server-side log on NexTechTools' side that records what any visitor's IP address was or what location was shown to them.
IP geolocation is based entirely on database lookups tied to how IP address blocks are assigned to ISPs and regions, not on any live positioning signal like GPS. It frequently resolves to a regional hub, a data center, or a nearby town rather than your literal street address, especially on mobile networks or behind carrier-grade NAT.
No. The lookup result is displayed directly in your browser from the geolocation provider's response and is never written to any database controlled by NexTechTools.
Each provider in the dropdown maintains its own independent geolocation database. Switching providers sends a fresh request to a different service with its own data, which can produce a different city, region, or ISP name for the exact same IP address — this is expected and is explained further in the Why ipwho.is Was Chosen section above.
No. The tool only reports the public IP address of the device currently viewing the page, determined the same way any website determines a visitor's IP — by observing where the request came from. It cannot be used to look up a third party's IP address remotely.