What is a public IP address?
Not 192.168. The number websites see, how NAT hides the LAN, and why you should check it.
A public IP address is the address the global internet uses to find your connection. It is not the 192.168 or 10.x number on your laptop. Those are private IPs, used only inside the home or office. NAT on the router translates many private devices into one (or a few) public IPs. When you ask “what is my IP,” you want the public one: IPv4, IPv6, or both.
Private vs public in one minute
Private ranges never route on the open internet. Your printer, TV, and phone can all be 192.168.1.something. The ISP only sees the router’s public IP. That is why every device in the house often shows the same IP on an IP lookup.
Public IPv4 is scarce. That is why CGNAT exists: the carrier puts another translator in front of you, and many customers share one public IPv4. Your “public IP” in that case is shared. Abuse complaints can hit the whole pool.
IPv6 can give you a globally routed address without that extra NAT. Then the public identifier is more specific to your line.
Who sees the public IP
Every website you visit, every API, every mail server that accepts your connection. Your ISP already knows it because they assigned it. An IP tracker cannot see inside your house, but it can guess IP location (city, region, country) and name the ISP.
Logs keep that number next to timestamps. Combined with a login, it is a strong hint it was your household. Combined with nothing else, it is still just a network.
Why you should check it
Confirm a VPN hid your IP. Confirm you are not on a workplace gateway. Copy the address when a game or a bank asks “is this you?” after a location jump. Compare IPv4 and IPv6 so one protocol is not leaking.
This site’s job is that check: public IP, IP geolocation, ISP, and coordinates at city scale.
Quick facts worth remembering
- Hiding the public IP means a VPN, proxy, Tor, or a different network, not a new wallpaper.
- HTTPS encrypts content; it still rides on a public IP.
- A static public IP is stable; a dynamic one rotates.
- Never treat a public IP as a secret password. Treat it as a handle you can change.
Know your IP address before you try to hide it. Otherwise you cannot tell whether the hide worked.