Reverse DNS uses PTR records to map an IP address to a Fully Qualified Domain Name (FQDN). Setting reverse DNS is important for SMTP mail servers. The majority of other applications don't need to worry about this DNS record. See this Wikipedia article for a general overview of reverse DNS, or refer to RFC 1035 for full details.
This guide explains how to set reverse DNS at Vultr.
Follow these steps to add a Reverse DNS record for your instance.
Follow the instructions for IPv4 or IPv6.
This updates the PTR record in Vultr's DNS. Reverse DNS updates may take several hours to propagate.
Server instances with IPv6 enabled are assigned a /64 IPv6 subnet.
The Vultr IPv6 calculator is a helpful tool for working with IPv6 addresses. Linux users may also use command-line tools such as
We also support reverse DNS for Vultr Load Balancers. See our feature reference for details.
Vultr offers an API endpoint to manage reverse DNS.