What is an IP (Internet Protocol) address?

Published: 9/19/2025

An IP address is a unique number that identifies a device on a network, such as the internet. Just like your home address tells the mail carrier where to deliver a package, an IP address tells computers where to send and receive information.

TL;DR

An IP address is the digital “address” for your device. It’s essential for connecting to the internet, but it also plays a big role in cybersecurity—helping defenders track suspicious activity while giving attackers a way to target systems.

What is an IP address?

Every device connected to the internet—computers, phones, servers, even smart home devices—needs a way to be found. That’s what an IP address provides. Think of it as a combination of a street address and a phone number: it points to your device’s location and makes communication possible.

There are two main types of IP addresses in use today:

IPv4 (Internet Protocol version 4): The older and most common format, written as four numbers separated by dots (for example: 192.168.1.1).
IPv6 (Internet Protocol version 6): A newer format created because IPv4 addresses started running out. It uses longer, more complex numbers and letters separated by colons (for example: 2001:0db8:85a3:0000:0000:8a2e:0370:7334).

Why do IP addresses matter in cybersecurity?

In cybersecurity, IP addresses are much more than technical details—they’re critical clues. Security teams use them to:

Identify suspicious traffic: Logs and alerts often show the IP of a suspicious login attempt or malware connection.
Block malicious activity: Firewalls and intrusion detection systems can stop known bad IP addresses from reaching your network.
Trace attacks: Investigators track IP addresses to understand where an attack originated (though attackers often hide their real ones).

This makes IP addresses a central piece of cyber defense. Without them, it would be nearly impossible to separate trusted network activity from potential threats.

Types of IP addresses

Here are the main categories you’ll come across:

Public IP addresses: Assigned by your internet service provider (ISP) and visible to the wider internet.
Private IP addresses: Used inside your home or organization’s internal network. These aren’t directly exposed to the internet.
Static IP addresses: Stay the same over time—common for servers or services that need a consistent address.
Dynamic IP addresses: Change periodically and are often used for personal devices at home.

How threat actors use IP Addresses

Just as defenders rely on IP addresses, attackers exploit them too. They might:

Scan ranges of IPs to find vulnerable systems.
Spoof IP addresses to make traffic look like it’s coming from somewhere else.
Track victims’ IPs to learn their location or network provider.

Because of this, IP addresses are often at the heart of both cyberattacks and investigations into them.

Protecting your IP address

While you can’t use the internet without an IP address, you can reduce the risks:

Use a firewall to block unwanted traffic.
Apply network security monitoring to detect unusual connections.
Use a VPN (Virtual Private Network) to mask your real IP address and add an extra layer of privacy.
Keep devices patched so attackers can’t exploit vulnerabilities tied to your network.

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What is an IP (Internet Protocol) address?

TL;DR

What is an IP address?

Why do IP addresses matter in cybersecurity?

Types of IP addresses

How threat actors use IP Addresses

Protecting your IP address

What is Fileless Malware? Detection & Prevention Guide

Amazon Web Services

What Is Cybersecurity Transformation?

Protect What Matters