When you sign up for internet service at your home or office, your provider assigns an IP address to your router so it can communicate with the internet. However, not all IP addresses act the same way. They fall into two main categories: Dynamic and Static.
What is a Dynamic IP Address?
A dynamic IP address is exactly what it sounds like: it changes. Most residential internet connections use dynamic IPs. Your Internet Service Provider (ISP) maintains a large pool of IP addresses. When your router turns on and connects to the network, the ISP temporarily assigns it an address from the pool using a protocol called DHCP.
- Why ISPs use them: Because not every customer is online 24/7, ISPs don't need a dedicated IP address for every single person. It is much more efficient and cost-effective to share a pool of addresses.
- Privacy benefits: Because your IP address changes periodically (every few days, weeks, or when you reboot your router), it makes long-term tracking slightly more difficult for advertisers.
What is a Static IP Address?
A static IP address never changes. Once assigned, it remains your digital address until you cancel your internet service or specifically request a new one. ISPs typically charge an extra monthly fee for a static IP address.
Do You Need a Static IP?
For 99% of home users, a dynamic IP address is perfectly fine. You only need a static IP if you are running services that require a consistent address for remote access.
You might need a static IP if you:
- Host a website or email server from your home.
- Run a dedicated gaming server for your friends.
- Need highly reliable remote access to a security camera system or a home NAS (Network Attached Storage) drive from outside your house.
If you don't know whether you have a dynamic or static IP, you almost certainly have a dynamic one. You can check our IP tool daily; if the numbers eventually change, you have a dynamic IP!