Understanding Router Ports: WAN, LAN, USB, and SFP

Why the ports matter on a listing

A router listing leads with the wireless standard and the bands, but the port line answers a different question: how wired devices connect. Every router uses one port to reach the modem and other ports to pass a wired connection to computers, consoles, printers, or a switch.

On this site, ports appear in a listing title or a bullet list as words such as multi-gig, USB, or SFP, or as a count of LAN ports. The catalogue does not count ports in its comparison, because the stated details rarely name every port. Read the port line on the maker's page next to the listing for the full picture.

WAN port: the connection to the internet

The WAN port, short for wide area network, is the port a router uses to reach the internet. On a listing it may be labeled WAN, internet, or by a speed class label. The router does not replace the modem or gateway; the WAN port connects the router to that equipment with an Ethernet cable. See the WAN port types guide for more on how this port appears on listings.

Some routers are listed with a dual-WAN label, meaning the router can take more than one internet source. Whether that works with a given service is a question for the provider, not for this site.

LAN ports: wired devices

LAN ports, short for local area network, are where wired devices plug in: a desktop, a game console, a printer, or a switch. The port line on a listing may state a count of LAN ports, but the catalogue does not count them. Check the maker's page for the count.

If a router has fewer LAN ports than the wired devices you plan to connect, a network switch is a separate purchase that adds more ports. The router's LAN port connects to the switch, and the devices connect to the switch.

Multi-gig ports as a listing term

Multi-gig is a label sellers put on ports meant for wired connections above gigabit. As a listing word, it tells you the port class, not the speed you will see. The label reads as a number followed by G. A multi-gig port may be on the WAN side, the LAN side, or both.

The catalogue does not state what a multi-gig port reaches; read the maker's page for the port's spec. The multi-gig router guide compares routers that state a multi-gig port in the title.

USB ports as a listing item

A USB port on a router is a listing item that tells you the router has a place to attach USB devices. What the port supports, such as storage or a printer, depends on the model and its firmware. The catalogue does not state what each USB port does; read the maker's page for the function list.

If a listing does not mention a USB port, the router likely does not have one. Treat the USB port as a feature to confirm on the maker's page, not as a promise of what any USB device will do. For more, read the USB port uses guide.

SFP ports as a listing word

SFP is a listing word for a small port that takes a removable module, often for fiber connections. SFP ports appear more on business-grade routers and some prosumer models than on ordinary home routers.

If a listing names an SFP port, it means the router has a slot for a module you buy separately. What the port accepts is a question for the maker's page. A reader who does not know why they need an SFP port can usually skip it. The SFP port guide explains how this port appears in listings.

Reading the port line on a maker's page

The listing title and bullet list give a short view of the ports. The maker's page, the spec sheet, and the manual give the full port line: the WAN port type and count, the LAN ports, any USB or SFP ports, and what each is for.

Check the maker's page next to the listing before buying. If a listing does not name a port, assume it is not there; if the maker's page and the listing disagree, the maker's page is the one to read.

• What is the WAN port labeled, and what does it connect to?
• How many LAN ports does the router have?
• What does the USB port support?
• What modules does the SFP port accept?

What to pick for wired devices

Match the ports named in the listing to the wired devices you plan to connect. A desk with a game console and a computer needs LAN ports for both devices; a home office with several wired devices can use a switch connected to one LAN port. See the best router guide for single units with wired ports.

For a console or PC desk, the listing may name gaming labels and ports in the same title. The gaming router guide compares gaming routers by stated details; read the maker's page for the port line. A mesh kit's units also carry ports, so the mesh system guide matters if you want wired connections at more than one point.

What to pick for your situation

Questions

What does WAN mean on a router?

WAN stands for wide area network. On a router listing, the WAN port is the one that connects to the modem or gateway.

How many LAN ports does a router have?

The catalogue does not count LAN ports. Read the port line on the maker's page; if a router has fewer LAN ports than you need, a switch can add more.

What can a USB port on a router do?

A USB port lets you attach USB devices such as storage or a printer, but what it supports depends on the model. Read the maker's page for the function list.

What is a multi-gig port?

Multi-gig is a listing label for a port meant for wired connections above gigabit. The label tells you the port class, not the speed you will see; read the maker's page for the spec.

Do I need an SFP port?

SFP is a listing word for a port that takes a removable module, often for fiber. If you do not know why you need one, you can usually skip it.

How do I find the port line on a router listing?

Look at the maker's page and the manual. Listing titles and bullets give a short view, while the maker's page gives the full port line.