What each record does
NS identifies a zone’s DNS servers. A and AAAA records connect a name to an IP address; CNAME creates an alias; MX routes email; and TXT records can support SPF, DKIM and ownership verification.
Before making changes
Save the current zone and confirm new values with support. When changing NS records, also migrate email and external-service records. TTL and caches affect how quickly changes propagate.
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