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Fintech Tenant DNS Change: Old Long TTL Effects on Activation

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A fintech platform giving every tenant a subdomain should prefer a platform-owned DNS zone when it needs predictable activation. Use a customer-owned zone when delegated control is a contractual or security requirement, but make DNS readiness an explicit state rather than treating one successful lookup as proof. The old TTL wins: lowering it after resolvers have cached the previous value does not shorten those existing cache entries. Choice Control over TTL and records Best fit during activation Main diagnostic cost Platform-owned zone Platform controls both Automatic tenant subdomains Disting

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