Knowing Your IP Address: A Must in the Digital Age

Have you ever noticed that some websites show you ads in Italian even though you never told them your language? Or that Netflix suggests different content when you're on vacation abroad? It all depends on your IP address. It is one of those things that have "always existed" but that very few people truly understand. In this article we explain what it is, how it works, and above all what you can do with this information.

What Is an IP Address?

IP stands for Internet Protocol. An IP address is fundamentally the phone number of your device on the internet: without it, no one would know where to send the data you requested.

Every time you open a website, watch a video, or send an email, your router sends the request with your IP address attached. The server responds to that address and the data arrives at you.

There are two main types:

• Public IP: the one the outside world sees. Assigned by your ISP (Fastweb, TIM, Vodafone, etc.) and shared by all devices on your home or corporate network.
• Private IP: the one internal to your network. Your router assigns a private IP to each device (PC, phone, smart TV) to distinguish them from one another.

IPv4 and IPv6: Two Different Formats

Most IP addresses you see today are in IPv4 format, which looks like this: 93.41.12.204. It is a 32-bit number, with about 4 billion possible combinations — which sounds like a lot, but the world has nearly exhausted them.

This is why IPv6 exists: a 128-bit format like 2001:0db8:85a3::8a2e:0370:7334, which offers a practically infinite number of addresses. Italy is still in transition, but many ISPs already assign both in parallel.

Why Knowing Your IP Is Useful

Diagnosing Connection Problems

When the network acts up, the first thing technicians always check is the IP. An IP of "0.0.0.0" or a strange address often signals a problem with the router or with DHCP assignment. Knowing your IP lets you:

• Understand whether your router successfully obtained an address from your ISP
• Check whether you are using IPv4, IPv6, or both
• Compare the current IP with the one from a few days ago (some ISPs change the IP periodically: this is called a dynamic IP)

Security and Unauthorized Access

Your IP tells the servers you connect to where you are geographically — not with GPS precision, but with a good approximation at the city and ISP level. This has concrete implications:

• Your bank accounts use the IP to detect anomalous access: if your bank sees you connected from Milan and five minutes later from Moscow, it blocks access.
• Logs of websites you visit store your IP for months or years. If you have an account on a site that suffers a breach, that IP identifies you.
• Public Wi-Fi networks (airports, cafes, hotels) share an IP among dozens of people: ideal for someone wanting to hide, risky if you don't use adequate protections.

Remote Access to Home or Office

If you want to connect remotely to your home PC, NAS, or surveillance cameras, you need to know your network's public IP. With a static IP (one that doesn't change) it's simple. With a dynamic IP (which changes every time the router restarts) you need a DDNS service that tracks the changes.

Understanding Geolocation

Services like Netflix, DAZN, or some banks use the IP to determine your location and restrict access to certain content based on country. Knowing your IP explains why you sometimes can't access something you'd like to see.

How to Find Your IP Address in Seconds

The fastest way is to use our free tool:

👉 Find your IP on speedtest.it

It shows not only your public IP, but also your ISP, country, city, and whether you are using IPv4 or IPv6. No installation, no account.

Alternatively you can use the terminal:

• Windows: ipconfig (private IP) — for the public IP you need an external website
• macOS/Linux: ifconfig or ip addr for the private IP
• Smartphone: in Wi-Fi settings, by tapping the network name

Static IP vs Dynamic IP: Which One Do You Have?

Most consumer contracts (Fastweb, Iliad, TIM fiber, etc.) assign a dynamic IP: it changes every time the router reconnects, and sometimes for no apparent reason. This is not a problem for everyday browsing.

Static IPs cost more and are found in business contracts. They are essential for those who manage servers, remote surveillance cameras, corporate VPNs, or services that must always be reachable at the same address.

If you don't know which one you have, run this test: note your IP today, turn the router off and on again tomorrow, and check whether it has changed.

Protecting Your IP: When and How

You don't need to become paranoid, but there are situations where it makes sense to mask or protect your IP:

• Public networks: always use a VPN when connecting to hotel, airport, or café Wi-Fi.
• P2P downloads: sharing files via torrent exposes your IP to everyone participating in the swarm.
• Remote work: many companies require a VPN precisely to route traffic through a controlled corporate IP.

A VPN replaces your real IP with that of the VPN server, making it much harder to trace back to you.

Frequently Asked Questions

Does my IP change if I switch ISP? Yes. Each ISP has a pool of addresses assigned by RIPE NCC (the European registry). By switching ISP, your IP will be in a different block.

Can someone use my IP to attack me? Knowing only your public IP is not enough to attack you directly: your router acts as a shield. But it is still good practice not to share it on public websites or forums.

How do I know if my IP is on a blacklist? Some verification services (like MXToolbox) check whether your IP has been reported as a source of spam or attacks. Especially useful if you manage a mail server.