What is used to uniquely identify devices connected to the Internet?

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What is used to uniquely identify devices connected to the Internet?

Identifying devices on the Internet is done with an IP address. An IP address serves as a unique label assigned to each device so that data can be routed to and from that device across networks. In every message, the IP header carries the source and destination addresses, enabling routers to forward packets toward the correct destination. There are IPv4 addresses (32-bit) and the much larger IPv6 addresses (128-bit), with DHCP and other mechanisms letting devices obtain these addresses automatically. Even though many devices behind a router may share a single public IP due to NAT, each device still has its own address inside its local network, and the router translates between private addresses and the public one. The other options don’t provide a global, unique identity for devices: a gateway address is the router’s address used to reach other networks, a device name is typically only meaningful within a local context, and a URL points to a resource rather than to a device itself.

Identifying devices on the Internet is done with an IP address. An IP address serves as a unique label assigned to each device so that data can be routed to and from that device across networks. In every message, the IP header carries the source and destination addresses, enabling routers to forward packets toward the correct destination. There are IPv4 addresses (32-bit) and the much larger IPv6 addresses (128-bit), with DHCP and other mechanisms letting devices obtain these addresses automatically. Even though many devices behind a router may share a single public IP due to NAT, each device still has its own address inside its local network, and the router translates between private addresses and the public one. The other options don’t provide a global, unique identity for devices: a gateway address is the router’s address used to reach other networks, a device name is typically only meaningful within a local context, and a URL points to a resource rather than to a device itself.

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