When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works .
A "DNS zone" is the collection of records, settings, and metadata for a given domain like tomshardware.com. The records are the main part, containing IP addresses, hostnames, or text lines including website and mail server IPs, subdomains, domain redirections, and spam-control or certificate info. If you're a Cloudflare customer, when you update a record pointing your website to a new IP, or change one of the domain's settings, the service pushes this information onto its many thousands of DNS servers.
This sounds easy enough until you realize that Cloudflare's DNS fleet is huge, and that the company now gets 800 zone changes per second, up from 250 four years ago. All those changes add up to enormous amounts of RAM and network traffic. Consistency across the entire fleet must be guaranteed, too, as you can't have one DNS server saying your website is at one place, while another server says it's elsewhere — except during actual transitions, of course. Furthermore, some domains hosted at Cloudflare have over 20 million records, making them exceedingly difficult to build in memory.
The easy solution, then, is to only update the data that's needed, and that's precisely what the company did for domain records back in 2022 . Updating records is simple: you just write the new value in and propagate it. Altering settings, though, is way trickier. For example, toggling Universal SSL for a domain can trigger a cascade of record updates.
Some metadata keys are shared across multiple zones, necessitating an update across all of them. Change events can come in from many Cloudflare services, too, and often didn't have a reason attached, so it was hard to know if other subsequent changes were necessary. Consequentially, setting updates required a full build for safety.
Cloudflare frees up 100TB of RAM by shrinking 1.1.1.1's DNS cache entries
Key considerations
- Investor positioning can change fast
- Volatility remains possible near catalysts
- Macro rates and liquidity can dominate flows
Reference reading
- https://www.tomshardware.com/networking/SPONSORED_LINK_URL
- https://www.tomshardware.com/networking/cloudflare-engineers-optimize-dns-build-services-for-twice-the-speed-and-85-percent-lower-ram-usage-finer-grained-processes-only-do-work-and-data-movement-thats-needed#main
- https://www.tomshardware.com/membership
- NVIDIA Cosmos Opens New Tools to Train, Evaluate and Deploy World Models
- SpaceX loses bid to dismiss lawsuit over xAI data center pollution
- NVIDIA Unveils Minerva to Bring End-to-End Observability for AI Factories
- AMD expects to outsell Intel in Q4 for the first time in history
- Google reveals new Gemini 4 Carbon AI model, narrowly beating Claude Opus 5.5
Informational only. No financial advice. Do your own research.