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Types of IP Addresses: Private vs. Public

Understand the difference between private addresses used inside networks and public addresses visible on the internet.


Private IP Addresses

Private IP addresses are used within a private network, such as your home, office, or a corporate LAN (Local Area Network). These addresses are specifically reserved for internal use and cannot be accessed directly from the internet, providing an additional layer of security.


Key Characteristics:

    • Devices within the same private network communicate with each other using private IP addresses.
    • Routers typically assign private IP addresses to devices via DHCP (Dynamic Host Configuration Protocol).
    • To communicate with external networks, private IP addresses rely on NAT (Network Address Translation), which maps private addresses to a public IP address.


    Examples of Private IP Address Ranges:

      • 192.168.0.0 to 192.168.255.255: Commonly used in home networks.
      • 172.16.0.0 to 172.31.255.255: Often used in larger networks.
      • 10.0.0.0 to 10.255.255.255: Frequently utilized in enterprise environments


      Public IP Addresses

      Public IP addresses are used to identify devices that are directly accessible over the internet. Each public IP address is globally unique to ensure proper routing of data between devices. Did you know? The first publicly registered IP address, 128.32.0.0, was allocated to the University of California, Berkeley in the early days of the internet!


      Key Characteristics:

        • Assigned by ISPs (Internet Service Providers) to devices or networks.
        • Enable communication with external devices and servers on the internet.
        • Typically required for websites, email servers, and any internet-facing services.


        Examples:

        Public IP addresses include any address not part of the private IP ranges listed above. For instance, 8.8.8.8 (a Google DNS server) is a public IP address.


        Key Takeaways

        • Private IP ranges are reused inside homes and businesses.
        • Public IP addresses are reachable across the internet.
        • NAT lets many private devices share one public IP address.

        Practice Exercise

        Find the private IP of your laptop or phone, then visit IPLocation.net to compare it with your public IP.