They are, however, allowed for subdomains like This is why Vercel recommends primarily using a www domain with a CNAME record, and adding a redirect from the non- www domain to it. Unfortunately, the DNS spec forbids using CNAME records on apex domains like.
This means that Vercel can quickly steer traffic in the case of DDoS attacks or for performance optimizations. Unlike A records, CNAME records avoid hard-coding a specific IP address in favor of an additional lookup at the DNS level. Using CNAME instead of A records ensures that domains on Vercel are fast, reliable, and fault-tolerant. Additional technical information about Domain redirects
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