This tutorial will look at various ways to check the TTL for a DNS record using the #[0], #[1], #[2] or #[3] (*BSD) command line, which is useful when you need to make changes to your server, such as moving VM/bare metal to another provider. https://www.cyberciti.biz/faq/how-to-see-time-to-live-ttl-for-a-dns-record/