At a fundamental level, an IP address is a number representing a device on a network. Expanding upon that, IP is a suite of protocols that facilitate communication between network devices through a process called routing. In IPv4, there are both private and public addresses. Public addresses are routable on the Internet, and potentially accessible from any part of the Internet. Firewalls will often protect the devices behind public addresses to ensure that only trusted traffic is allowed through. Private addresses are only routable on local area networks (LANs) and can’t directly reach public addresses without the use of network address translation (NAT).
Articles in this section
- How do I check my ONT (Optical Network Terminal) for connectivity?
- What is a VPN?
- What is DNS? What is reverse DNS?
- What is ARIN and do I need to register?
- What happens to my IP address if I move or change my Internet Service Provider (ISP)?
- What is the difference between a "single static IP" and a "block" lease?
- Do IPv6 and IPv4 addresses look different?
- What is IPv6, and do I need it?
- What is the difference between a dynamic IP and static IP?
- Why would I need a static IP address?