What your IP address really reveals
Between those who think an IP address gives away a street address and those who consider it harmless, the truth is more nuanced, and more interesting.
What any website learns
The moment you open a page, the server receives your IP address. It cannot do otherwise: without it, it would not know where to send the reply. From that address alone, it gets three things.
Your internet provider. This is the most reliable piece of all. Address ranges are allocated to operators through public registries, and learning that an address belongs to a given provider takes one lookup. The accompanying AS number identifies the network precisely.
A rough location. It comes from commercial databases that map address ranges to places, built from operator declarations and cross-referencing. The country is almost always right. The city much less so: depending on the range, the error runs from a few kilometres to several hundred. A rural connection is often placed in the capital, simply because the operator declared its exit point there.
A hostname. Many addresses have a reverse DNS record naming the operator and sometimes the technology or the local exchange. That is technical information, not personal.
What it does not give
Not your name, not your street address, not your phone number, not your identity in any form. None of that exists in the address or in the databases that describe it.
The link between an address and a subscriber does exist, but one party holds it: your provider. It keeps connection records and can disclose them only under a defined legal process. No online service, no paid tool, no site promising to "trace an IP" has that mapping. Those that claim otherwise are lying.
What websites actually do with it
The most common use is advertising. Your address works as a stable identifier that links your visits together, including after you clear cookies, and enables geographic targeting.
Next comes geographic restriction: streaming catalogues, sports rights and some commercial offers depend on the country inferred from your address. That is the main reason people look into hiding their IP.
More quietly, dynamic pricing: some retailers adjust prices based on the detected region or connection type. And finally security, a legitimate use, where the address helps flag an unusual sign-in or block automated behaviour.
The real risks for an individual
They exist, but they are not the ones people imagine. The most frequent concrete case involves online gaming: on platforms where players connect directly to each other, an opponent can read your address and flood your connection. It is annoying, temporary, and unrelated to any threat to your identity.
The second case is blocking: your address can land on a blacklist because of another subscriber who used it before you, which happens with dynamic addresses and earns you endless captchas.
The idea that a stranger could "find you" from your IP address alone, however, is folklore. They will learn your provider's name and an approximate city, which enables nothing.
Checking what you expose
The home page shows you exactly what a website sees: the address, the operator, the inferred location and the hostname. Compare the location shown with where you actually are; it is often instructive about how reliable these databases are.
The "What your browser reveals as well" section completes the picture with what your address does not say but your browser hands over freely: system, language, time zone, resolution. Put together, those often identify you better than your IP address does.