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What Is an IP Address?
What Is an IP Address? An IP address (Internet Protocol address) is a number that identifies a device on a network. It works like a home address for computers. IPv4 : 32 bits, like 192.168.1.10 . Still the most common. IPv6 : 128 bits, like 2001:db8::10 . Much bigger address space. Every data packet
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What it is
An IP address (Internet Protocol address) is a number that identifies a device on a network.
It works like a home address for computers.
Two versions
IPv4: 32 bits, like 192.168.1.10. Still the most common.
IPv6: 128 bits, like 2001:db8::10. Much bigger address space.
How it is used
Every data packet carries a source IP (who sent it) and a destination IP (where it goes).
Why it matters for security
Every log, firewall rule and alert uses IP addresses.
Example: “Brute force from 198.51.100.7” tells the defender which IP to block.
Learn more in the lesson: 1.1 What Is an IP Address?