The cybersecurity company, which had raised $51m from backers including Cisco, will be integrated into the corporate's Security Business Group.

Networking equipment provider Cisco plans to acquire one of its portfolio companies, US-based cybersecurity technology developer OpenDNS, for $635m in cash.

OpenDNS was originally launched as a domain name system (DNS) service, but has latterly pivoted into a business that produces cloud-based software which offers advanced threat protection technology that can be used on any device.

Cisco intends to incorporate the broad visibility and threat intelligence capabilities of OpenDNS’s platform to enhance its Cisco Security Business Group offering.

Cisco was…