Cisco to buy cybersecurity firm OpenDNS in $635m deal
The deal will give Cisco better visibility into the security and threat landscape. — Cisco has announced its intention to purchase threat protection security firm OpenDNS in a deal worth $635 million.
Context & Ripple Effects
The OpenDNS purchase is the opening move in what becomes Cisco's defining M&A strategy of the decade: buying its way from networking hardware into a full security software stack. The stated rationale — better visibility into threats — points at DNS as a sensor layer sitting across every network Cisco already sells.
What came after confirms the pattern rather than a one-off: within months Cisco followed with the Lancope network-security deal, then kept layering on cloud-native assets like Duo Security, ThousandEyes, and eventually the ~$28B Splunk acquisition — an escalation in deal size that makes this $635M entry point look like the template's first data point.
First-order effects
- OpenDNS's DNS-based threat intelligence becomes part of Cisco's security portfolio immediately, giving Cisco telemetry from customer traffic that complements its installed base of routers and switches.
- Cisco's existing security customers get a bundled option: threat protection delivered through infrastructure they already buy from Cisco rather than a standalone vendor.
Second-order effects
- Standalone DNS- and network-security vendors face a competitor that can bundle detection with hardware sales, pressuring them toward their own consolidations or platform partnerships.
- The quick succession of the Lancope deal shows Cisco treating security as a build-by-acquisition category, forcing rivals to respond with comparable portfolio breadth or concede the integrated-stack argument.
Third-order effects
- If the cadence holds — and it does, through Duo, ThousandEyes, Splunk, and reported advanced talks for Axonius at ~$2B — Cisco's structure shifts from hardware company with security attach rates to a security-first software business funded by the networking cash cow.
The trend: Cisco is assembling a security platform through serial acquisitions whose size escalates from the hundreds of millions in 2015 to tens of billions by 2023, converting network-market dominance into a software-led identity.