What is it for?
An IP address lets routers know where to send data packets. When you open a page, the server must know the connection address to which to send the response. This is technical information that is essential to the functioning of the Internet, comparable to a return address for a network conversation.
What it does not reveal
An IP does not contain your name, postal address, or the identity of the people behind the connection. It can indicate an operator, a network range, and sometimes an approximate geographic area. This approximation depends on bases maintained by external suppliers and can be shifted.
Public and private
The public IP connects your router, router, or mobile device to the internet. Private IPs are used in your local network, for example between a box, a computer and a phone. Multiple devices in a home often share the same public IP through NAT.
Why it can change
Depending on the operator and the offer, the public IP can be fixed or dynamic. A reconnection, a box restart or a change of network can change the address visible from the Internet. On the other hand, changing IP does not remove other traces such as connected accounts or cookies.
Frequently asked questions
Does an IP identify a person?
No. It reliably identifies a network connection or egress point, not a physical person.
Why does my displayed IP differ from that of my box?
Your carrier may use NAT, CGNAT, IPv6, or a VPN. The address visible to a site is the one used for the current query.
Reference sources
To be explored next
Published and verified by the VoirMonIP.com team on July 15, 2026.