In the context of IP addressing, what does "routable" signify?

In the context of IP addressing, "routable" signifies that an IP address can be accessed from any device on the internet. This means that the address is part of a range designated for use on the public internet, allowing traffic to flow to and from that address without restrictions. Routable IP addresses are necessary for devices that need to communicate with other devices outside of their local network, such as web servers or any internet-connected services.

The concept of routability contrasts with private or non-routable IP addresses, which are intended for use within local networks. These non-routable addresses cannot be accessed directly from the internet, thus isolating devices within a specific private network. This clear distinction emphasizes why routable addresses must adhere to the structure and guidelines set forth by the Internet Assigned Numbers Authority (IANA).

This answer highlights the primary purpose of routable addresses in facilitating global communication across networks, setting them apart from addresses used solely for local communication or restricted access.