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Public vs Private IP Address

#Proxy
2024-12-24 08:029 min read

Content Introduction

This video explains the differences between public and private IPv4 addresses. It begins by defining an IP address and the necessity of every device having one for communication on a network. Public IP addresses are unique, registered, and provide internet access, assigned by ISPs. In contrast, private IP addresses are not publicly registered and are used internally within home or office networks. They are assigned by routers through DHCP and require translation to public IPs via NAT to access the internet. The video also covers the classification of private IP addresses (Class A, B, and C) and how to find both public and private IP addresses on various operating systems. The key distinctions include the unique nature of public IPs, their necessity for internet access, cost implications, and security considerations. The video concludes by emphasizing the security advantages of private IPs and promotes the use of VPNs for safer internet browsing.

Key Information

  • IP addresses are numerical identifiers for devices on a network, with two types: public and private.
  • Public IP addresses are assigned by internet service providers and are necessary for internet access; they are unique and registered on the internet.
  • Private IP addresses are used internally within networks (homes or businesses) and are not registered on the internet; they need to be converted to public IPs for internet access via NAT (Network Address Translation).
  • Private IP addresses come in three classes: Class A (10.x.x.x), Class B (172.x.x.x), and Class C (192.x.x.x), with Class C being the most common.
  • Public IP addresses require payment for use, while private IP addresses are free.
  • Public IPs are less secure as they are traceable, while private IPs are more secure as they are hidden from the internet.
  • To check your public IP address, you can use websites like 'whatsmyipaddress.com.'

Timeline Analysis

Content Keywords

Public IP Addresses

Public IP addresses are assigned by internet service providers and are unique identifiers that allow access to the internet. Each public IP address is registered, meaning there are no duplicates globally. Without a public IP, devices cannot connect to the internet.

Private IP Addresses

Private IP addresses are used internally within networks, such as homes and businesses. They cannot be accessed from the internet directly and are not registered publicly. These addresses are assigned by routers, and multiple devices can share the same private IP address.

NAT (Network Address Translation)

NAT is a service within routers that translates private IP addresses to public ones for internet access and vice versa. This enables multiple devices with private IPs to communicate externally through one public IP.

IP Address Classes

Private IP addresses are categorized into three classes based on their range: Class A (starting with 10), Class B (starting with 172), and Class C (starting with 192). Class C is most commonly used in home networks.

Finding Your IP Address

To find your device's IP address, Windows users can use the command 'ipconfig', while Mac and Linux users should use 'ifconfig' in the terminal. To find your public IP, visit websites like whatsmyipaddress.com.

Security of IP Addresses

Public IP addresses are not secure and can be traced, necessitating additional security measures like VPNs. In contrast, private IPs are more secure as they are hidden from the internet and cannot be traced externally.

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