Public and private IP addresses — examples

Understand why a local 192.168 address can differ from the address shown by an IP checker. Compare private, documentation and connection addresses.

Your device can have a private address on a home network while a website observes a different connection address. The first example, 192.168.1.10, is in the private IPv4 range. The second, 203.0.113.7, is reserved for documentation and is not a real public server in this example.

Example input

192.168.1.10
203.0.113.7

Expected result

192.168.1.10 → RFC 1918
203.0.113.7 → TEST-NET-3 (RFC 5737)

Try it step by step

  1. Compare the two example addresses with their classifications below.
  2. Open the connection checker to see the address observed for this connection.
  3. Compare that result with your device network settings. If you use a VPN or proxy, consider that the site may observe its exit address.

How to read the result

For IPv4, private ranges are 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. A router can translate private addresses to an external address, and an ISP can add another translation layer. An address outside those three ranges is not automatically globally reachable; other special-use ranges exist.

Limits and important details

An IP address does not uniquely identify a person or prove a precise physical location. The checker reports the address used by this connection, not every address on your device. The documentation address is deliberately reserved and is never presented as the visitor address.

RFC 1918 · RFC 5737

Open the tool

What do we check and what happens to your data?

The server reads the IP address of your connection, then asks its DNS resolver for that address’s PTR record. Your browser only connects to this website for this check.

The tool does not save a lookup history or IP addresses in application logs. It does not use analytics. The infrastructure provider may process connection data to operate the service. The result does not include your location or computer name. A hostname is not the address of the DNS server configured on your device.

Adsterra advertisements load automatically. The provider receives your IP address and browser data and may use cookies. Ads run in frames on a separate origin, without access to the page’s IP/DNS result.

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