A massive cyberattack on Friday on a key piece of internet infrastructure included "10s of millions" of individual devices that were coordinated using a piece of computer code recently released online. 

Dyn, the company subject to the attack, released more details about the incident on Saturday, including the fact that more than 10 million distinct IP addresses were part of the botnet that caused widespread problems for users trying to access many major websites.

The attack used a piece of code that combs the internet for connected devices with weak security, then hijacks them to be used in distributed denial of services (DDoS) attacks. A DDoS attack uses a heavy flow of traffic to target and disrupt particular systems, rendering them unusable.

Kyle York, the chief strategy officer at Dyn, announced the new details as part of the company’s investigation into the attack.

He noted that Dyn’s systems are back to normal, but that the company is still on the lookout.

"At the time of this writing, we are carefully monitoring for any additional attacks," he wrote. 

Flashpoint, a cybersecurity firm that is working with Dyn, told Mashable that among the devices hijacked for the attack were digital video recorders.