Take a look at PowerDNS. I use it for my day job and it causes very little trouble. I can only recall one annoying bug and one security issue in about the last

Take a look at PowerDNS. I use it for my day job and it causes very little trouble. I can only recall one annoying bug and one security issue in about the last two years. It also has an OK, if not great, API for integrating with, e.g., your provisioning system, inventory system, etc.