To support Internet speeds of more than 100 Mbps, you need a Gigabit router. Your ISP or Internet Service Provider typically provides a compatible Gigabit router for modern high-speed fiber broadband plans. But if you have an older model you already own and are routing your Internet through that, you may want to check whether your router supports Gigabit. You can check the model of your router printed on its front or back, then check its specifications online.