Last Updated on August 7, 2025 by Arnav Sharma
If you’ve looked at the back of your router, you’ve probably seen a collection of strange-looking ports. Two of the most important are WAN and LAN ports. Understanding the difference between the two is key to setting up your home network. In this blog post, we’ll dive into what a WAN port is, how it works, and why it matters.
What is a WAN Port?
- WAN stands for Wide Area Network. This is the network that connects you to the internet. Your WAN port is used to connect your router to your internet service provider’s (ISP) modem.
- The WAN port is a socket on your router that establishes a connection between your local network and the wider internet.
WAN vs. LAN
- LAN stands for Local Area Network. This is the network of devices connected to your router at home or in your office. Your LAN ports are used to connect devices like computers, printers, and gaming consoles to your router via Ethernet cables.
The Key Difference
The big difference between WAN and LAN ports is what they connect to:
- WAN port: Connects your router to the wider internet.
- LAN ports: Connect devices within your home or office network.
How is a WAN Port Used?
- Connecting to the Modem: An Ethernet cable plugs into your WAN port on one end and the modem provided by your ISP on the other.
- Establishing the Connection: This connection allows the router to access the internet.
- Sharing the Internet: The router distributes the internet connection to all devices connected โ both wired and wireless (Wi-Fi).
Additional WAN Port Information
- Appearance: The WAN port is usually a different color and separated from the LAN ports on your router. Look for labels like “WAN” or “Internet”. It’s typically an RJ-45 Ethernet port, which looks like a larger version of a phone jack.
- Number of Ports: Most routers have one WAN port. Occasionally, routers come with dual WAN ports for advanced uses like load balancing or failover.
- IP Address: The WAN port receives a public IP address from your ISP, identifying your network on the internet.
WAN, LAN, and Wi-Fi: How They Work Together
Think of your home network like this:
- WAN: The highway bringing the internet to your home.
- Router: The traffic cop directing the internet traffic within your home.
- LAN: The local streets within your neighborhood.
- Wi-Fi: The wireless pathways devices use to connect to the network.
Need More LAN Ports? If you run out of LAN ports to connect wired devices, you can buy a switch and connect the switch to one of the LAN ports on the modem.