IP addresses and rDNS

Every server gets its own static IPv4 address when it is created. The address stays with the server for its whole life; when you delete the server it is released, held in quarantine for a while, then returned to the pool.

Finding your address

The Network tab on the server detail page shows your IPv4 address, rDNS record and SMTP status. The IP Addresses page lists every address in the project.

rDNS (reverse DNS)

An rDNS record says which hostname an IP address belongs to. It matters most if you run a mail server: receiving servers usually reject or spam-flag addresses with no rDNS record.

Edit the rDNS value from the Network tab. It must be a valid hostname (for example mail.example.com), and that hostname's A record should point back to the same IP — consistency is checked in both directions.

SMTP (25 and 465) closed by default

Outbound ports 25 and 465 are closed on all servers to prevent abuse. This is standard practice in the industry: it stops newly created servers from being used to send spam and protects the reputation of our IP ranges.

If you need to run your own mail server, contact support to request access.