🖥️ Private IP vs Public IP Address

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🧠 Definition:

• Private IP Address:
  Used inside a private network (LAN) — identifies devices like PCs, printers, and routers within a local area.
  Example: 192.168.1.10

• Public IP Address:
  Used on the Internet — identifies your network or device globally so it can communicate with other networks.
  Example: 8.8.8.8

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🔹 Key Differences

Feature	Private IP Address	Public IP Address
Scope	Used within local/private networks	Used on the Internet (global scope)
Uniqueness	Can be reused in different networks	Must be unique worldwide
Assigned by	Network Administrator or Router (DHCP)	Internet Service Provider (ISP)
Accessibility	Not reachable from the Internet	Reachable over the Internet
Security	More secure, hidden from external access	Less secure, visible on the Internet
Example Ranges	10.0.0.0 – 10.255.255.255 172.16.0.0 – 172.31.255.255 192.168.0.0 – 192.168.255.255	1.0.0.0 – 223.255.255.255 (except private ranges)

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💡 Quick Example

At home or school:

• Private IP (Internal): 192.168.1.5 → Your laptop

• Public IP (External): 122.175.34.10 → Your network’s router (assigned by ISP)

When you visit a website, your router uses NAT to translate your private IP into the public IP for communication.

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💬 Teaching Tip

“Think of a Private IP as your house address inside a housing society, and the Public IP as the main gate address of the society — the world only knows that gate, not each house inside.”