What can someone do with your IP address?
Nicolas,
Your IP address is visible to every website, application or server you communicate with on the internet. In the vast majority of cases, it poses no danger — it is simply a technical identifier necessary for online exchanges to work. But in the wrong hands, an IP address can be exploited for malicious purposes. Here is what can realistically be done with an IP address, and what belongs to the realm of myth.
1. Geolocate you approximately
This is the most common and most harmless use. From an IP address, anyone can determine your approximate location: country, region, sometimes city. This geolocation is performed using public databases like those from MaxMind or ipinfo.io, which associate IP address ranges with geographic areas.
This location is approximate — it can be wrong by several tens of kilometres — and reveals neither your exact address nor your identity. It generally corresponds to the location of your ISP's point of presence, not your home.
2. Identify your internet service provider
An IP address makes it easy to identify your ISP as well as the type of connection (residential, business, mobile). This information is public via WHOIS databases and regional registries like RIPE NCC.
This data is legitimately used by websites for geolocation, advertising targeting or fraud detection. It does not allow identifying the subscriber behind the address — only the ISP can link an IP address to a subscriber, via a court order.
3. Launch a DDoS attack against you
If a malicious actor knows your IP address, they can theoretically target your connection with a DDoS attack (Distributed Denial of Service): sending a massive volume of traffic to your address to saturate your internet connection and make your access unusable.
This type of attack is rare against individuals — it requires significant resources and is illegal in most countries. It is more common in the context of competitive online gaming, where some ill-intentioned players seek to disconnect their opponents.
Good to know: if you think you are the victim of a DDoS attack on your home connection, restart your router — your ISP will generally assign you a new dynamic public IP address, ending the attack. For more robust protection, a VPN hides your real IP address from your online contacts.
4. Attempt to hack your devices
Knowing your public IP address is a first step for an attacker looking to scan your open ports or exploit vulnerabilities on your network. This does not mean they can directly access your devices — several security layers stand in the way (router firewall, NAT, operating system).
However, if your network has weaknesses — administration port open to the internet, exposed vulnerable service, outdated router firmware — a known IP address becomes a potential entry point.
- Keep your router firmware up to date
- Disable remote access to the administration interface (WAN)
- Do not expose unnecessary services to the internet
5. Track you across different websites
Advertising networks, analytics tools and certain third-party services can correlate your IP address with your browsing behaviour across multiple sites, even without cookies. This practice, legal in some jurisdictions, helps build a profile of your online habits.
Browser fingerprinting combined with the IP address is one of the hardest techniques to circumvent when trying to preserve online anonymity.
6. Report your address to authorities (legally)
If you commit illegal acts online, your IP address can be passed to your ISP by a judicial authority via a court order. Your ISP can then link the IP address to your subscriber identity. This is how investigations into illegal downloading, cybercrime or online threats work.
What an IP address CANNOT do
| Common misconception | Reality |
|---|---|
| Find your exact address | Impossible — IP geolocation is approximate |
| Identify your name and identity | Impossible without a court order to the ISP |
| Directly access your computer | No — router and firewall act as a barrier |
| Read your files or passwords | No — IP address alone gives no access to data |
| See your browsing history | No — only your ISP can access this data (on court order) |
How to protect your IP address?
Several methods allow you to hide or protect your public IP address:
- VPN: replaces your IP address with that of the VPN server — the most effective and widespread solution
- Proxy: acts as an intermediary between you and the internet, masking your real IP address
- Tor: routes your traffic through multiple encrypted nodes — very anonymising but slow
- Router restart: allows you to obtain a new dynamic IP from your ISP
Good to know: your IP address potentially changes with every reconnection if your ISP assigns you a dynamic IP. You can check your current IP address and associated information — ISP, country, connection type — from any online IP verification tool.