DNS (Domain Name System)
What is it?
DNS is the internet's phone book. When you type cloudflare.com into your browser, DNS translates that human-readable name into an IP address (like 104.16.132.229) that computers use to find each other. Cloudflare operates one of the fastest and most reliable authoritative DNS services in the world, handling trillions of DNS queries per month.
What problem does it solve?
Without DNS, you'd need to memorize IP addresses for every website you want to visit. But beyond basic name resolution, Cloudflare DNS solves three critical problems:
- Speed: Traditional DNS providers can be slow, adding hundreds of milliseconds to every page load. Cloudflare's DNS responds in under 10ms on average because it runs on a global network spanning 300+ cities.
- Reliability: If a DNS provider goes down, every website using it becomes unreachable. Cloudflare's anycast network means there's no single point of failure.
- Security: DNS was designed in the 1980s without security in mind. Attacks like DNS spoofing can redirect users to malicious sites. Cloudflare supports DNSSEC (DNS Security Extensions) to cryptographically verify DNS responses.
How does it work?
- A user types a domain name into their browser.
- The browser asks a recursive resolver (like Cloudflare's 1.1.1.1) to look up the domain.
- The resolver queries the authoritative DNS server for that domain — this is where Cloudflare sits for its customers.
- Cloudflare's authoritative server responds with the correct IP address.
- The browser connects to that IP and loads the site.
Cloudflare customers point their domain's nameservers to Cloudflare, making Cloudflare the authoritative source for their DNS records. This is also how Cloudflare gets "in the path" of traffic — once DNS is handled by Cloudflare, all the other products (CDN, WAF, DDoS protection) can be layered on.
Why it matters strategically
DNS is the front door to the entire Cloudflare platform. It's the first thing customers set up, and it's how Cloudflare inserts itself into the traffic flow. Nearly every Cloudflare customer starts by changing their nameservers. This makes DNS both the top of the funnel and the foundation that every other product builds on.