DNS Changes: Understand TTL and Plan a Safe Migration

DNS changes are not always visible everywhere at once. Resolvers cache answers according to TTL, and a resolver may continue returning an older record until its cache expires.Before moving a website, inventory the A and AAAA records, CNAMEs, MX records, TXT records, and any service-specific records. Lowering TTL ahead of a planned migration can shorten the transition, but do it early enough for th...