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If your website is on the internet, hosted by a commercial hosting company, and by private IP addresses you mean IP addresses in one of the three ranges reserved by ICANN for private use (or the range reserved for link-local addresses), then the answer is NO! Those addresses are never supposed to appear on the Internet. That said, remember that hackers often do things that they are not supposed to do, although in this case it would be difficult for a hacker to hit your site with a private IP and get any response back, since the Internet routers would not know what to do with such an address except to drop it. And THAT said, ...

Private IP addresses do sometimes "leak" onto the Internet. Three possibilities I can think of offhand are:

1. Someone using Network Address Translation (NAT) to connect two or more computers to his/her ISP with a single public IP address may have the setup misconfigured so that the private address of one (or more) computer(s) is being sent out on the Internet. That would produce a very disappointing result, since he/she would never get anything back off the Internet (not even your public webpage).

2. Someone at your hosting company may be hitting your website from an internal corporate computer. If that computer is using a private IP on their internal LAN, and the computer your website is hosted on also has a private IP address on the LAN in addition to its public address, the other computer's private IP address may be showing in your server logs.

3. If your website is located on a computer that has an interface to YOUR internal LAN as well as to the public Internet, then you could very well receive hits from other computers on the LAN -- which would presumably be using private IP addresses.

Hope this helps.

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