It really depends on what you mean by prefix. Most likely your router is running a NAT, and doing this: > As traffic passes from the network to the Internet, t

It really depends on what you mean by prefix. Most likely your router is running a NAT, and doing this: > As traffic passes from the network to the Internet, the router translates the source address in each packet from a private address to the router's own public address. The router tracks basic data about each active connection (particularly the destination address and port). When the router receives inbound traffic from the Internet, it uses the connection tracking data it stored during the outbound phase to determine to which private address (if any) it should forward the reply. [1] See: [0] https://en.wikipedia.org/wiki/IP_header https://en.wikipedia.org/wiki/IP_header [1] https://en.wikipedia.org/wiki/Network_address_translation https://en.wikipedia.org/wiki/Network_address_translation