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NetworkingFloating IPs

Set reverse DNS

Set the hostname others see when they look up a floating IPv4 address, which mail servers check before accepting your mail.

Reverse DNS (a PTR record) is the hostname others see when they look up your IP address. Mail servers check it, so set it on any address you send email from.

Before you start: point an A record for the hostname at the address first. Mail servers may reject mail when the two don't match. Reverse DNS for IPv6 addresses isn't available yet.

  1. Open the floating IP and find Reverse DNS.
  2. Select Edit and enter the Hostname, for example mail.northwind.example.
  3. Select Save.
The Reverse DNS card with the hostname fieldThe Reverse DNS card with the hostname field

Lookups show the new name within 5 minutes. Use default goes back to the original name.

Move a floating IP

Assign a floating IP to a server, move it to another one for failover, or unassign it while keeping the address reserved for later.

Release a floating IP

Release a floating IP you no longer need to stop its hourly charge. The address goes back to the pool and you can't get it back.

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