Hello. We make DNS Notify. It emails you when a DNS record, nameserver set, TLS certificate or domain registration changes, and shows the old value next to the new one. We built it for our own domains first. Most of the work went into the email it does not send: TTL changes, rotated answers, SOA serial bumps and routine renewals all stay quiet. The scanner and lookups are free, no account: https://dnsnotify.com #DNS #sysadmin #introduction