What is the public IP address?
What is the private IP address?
Public vs private IP address: what are the differences?

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What Is Public IP Address?
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What Is the Private IP Address?
As for most aspects, the Private IP address is the same as a public IP address.
It is a unique identifier for all the devices behind a router or other devices that servers IP address.
In IP web connection, a private web connection is a web connection that uses private IP address space.
Both the IPv4 and IPv6 specifications define private IP address ranges.
Besides, these addresses are commonly used for LANs, offices, enterprise environments and so on.
The private IP address is not allocated to any specific organization.
Public VS Private IP Address: What Are the Differences?
After knowing what the public and private IP address are, do you know what their differences are?
Format
As for the Format, they also are different.
The private IP address offers uniformly, while the public IP addresses are different from the varying range.
However, as for the public IP address, the Internet Service Provider controls the Public IP address.
Cost
The private IP address is free for use, but the public IP address need to be paid.
However, if you want to know the public IP address, the method would be complicated.
you better search online like Google.
Here are four methods in this post.
Range
The private IP address has the following three ranges.
As for the public IP address, the rest of private IP addresses are public.