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IP
Also known as: IP Address, Internet Protocol Address, IP4, IPv4, IP6, IPv6
What is an IP Address?
IP (Internet Protocol) is a foundational networking standard that defines how data is transmitted across networks. It assigns unique numerical identifiers to devices, enabling them to communicate over the internet or local networks. An IP address serves two primary functions: it identifies the host's network interface and provides its location within the network, allowing data packets to be routed correctly.
How IP Addresses Work
IP addresses operate at the network layer (Layer 3) of the OSI model. When a device sends data, it includes the source and destination IP addresses in the packet header. Routers use these addresses to forward the packet toward its destination. For example, when you request a webpage, your device's IP address is included in the request, and the server responds using the destination IP address.
#### Diagram-in-words
1. Device sends request: Your computer (IP: 192.168.1.5) sends a request to a server (IP: 203.0.113.45). 2. Router receives packet: A router receives the packet and checks the destination IP address. 3. Routing decision: The router forwards the packet to the next hop based on its routing table. 4. Server responds: The server sends the response back to your device's IP address.
IP Address Formats
IP addresses can be represented in three formats:
- Binary: 11000000.10101000.00000001.00000001
- Dotted-decimal: 192.168.1.1
- Hexadecimal: C0.A8.01.01
Example of IP Address Usage
Consider a web server with the IP address 192.0.2.1. When a user accesses a website hosted on this server, their device sends a request to 192.0.2.1. The server processes the request and sends the webpage back to the user's IP address, which might be 192.168.0.100. This exchange ensures data reaches the correct destination.
When You Use IP Addresses
Use IP addresses when:
- Directing network traffic: Routers use IP addresses to forward packets.
- Troubleshooting connectivity: Network administrators analyze IP addresses to identify issues.
- Securing systems: Firewalls block or allow traffic based on IP addresses.
- Privacy is a concern: IP addresses can reveal geographic locations.
- Dynamic environments: Devices with dynamic IPs may change frequently.
- Complex network configurations: Subnetting and routing require additional tools.
Related Concepts
- What is an IP Address? How it works? How to Locate it? | Fortinet provides an in-depth explanation of IP address functions.
- IP address, Network address, and Host address Explained details how IP addresses are divided into network and host portions.
- Hosting refers to the services that provide IP addresses to devices.
External References
- RFC 791: Internet Protocol defines the original IP protocol.
- IPv4 Addressing explains IPv4 and IPv6 address formats.