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Public vs private IP address
You have at least two IP addresses: a private one on your home or office network and a public one the rest of the internet sees. Here is how they differ.
Public IP address
A public IP address is unique across the internet and is assigned by your internet service provider (or your VPN). Every website you visit sees it. All devices behind the same router normally share one public address. To see yours, open the IP checker.
Private IP address
A private IP address is used only inside your local network, such as your Wi-Fi at home. Many networks reuse the same ranges, so private addresses are not unique worldwide and are not reachable directly from the internet. The reserved private ranges are:
| Range | Typical use |
|---|---|
10.0.0.0 – 10.255.255.255 | Large and corporate networks |
172.16.0.0 – 172.31.255.255 | Mid-size networks, some cloud setups |
192.168.0.0 – 192.168.255.255 | Home routers (very common) |
How NAT connects the two
Your router performs network address translation (NAT). When your laptop (private 192.168.1.20) loads a website, the router swaps in its public address, sends the request out, and routes the reply back to the laptop. This is why your phone, TV and computer all appear online as one address.
Why the difference matters
- Remote access: to reach a device at home from outside, you need your public IP plus port forwarding (or a VPN or tunnel).
- Troubleshooting: support teams usually want your public IP; local network tools use the private one.
- Privacy: your private address is not exposed to websites; your public one is.
- Dynamic addresses: most home public IPs can change when your router restarts or your lease renews.
Ever seen an address starting with 169.254? That is a link-local address your device gave itself because it could not reach a DHCP server, a sign of a network problem.
Frequently asked questions
Is 192.168.1.1 a public IP?
No. It is a private address, commonly used by home routers as their local admin address.
Can someone find my home address from my IP?
No. A public IP reveals roughly your city and provider, not your street address. Only your provider can link the IP to your account.
Does my public IP change?
Often, yes. Most residential connections use dynamic IPs. Business plans can include a static IP.
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