The US has banned new foreign-made consumer internet routers over national security concerns.

In an update on Monday to a list of equipment seen as not secure enough for use, the Federal Communications Commission (FCC) added all consumer-grade routers made outside the US.

It puts routers - which are used widely in homes and businesses to connect computers, phones, TVs and other devices to the internet - on a par with foreign-made drones, which were banned at the end of last year.

"Malicious actors have exploited security gaps in foreign-made routers to attack American households, disrupt networks, enable espionage, and facilitate intellectual property theft," the FCC said.

While people will still be able to use foreign-made routers they already own, the ban applies to all "new device models."