- app – Application Server (non-web)
- sql – Database Server
- ftp – SFTP server
- mta – Mail Server
- dns – Name Server
- cfg – Configuration Management (puppet/ansible/etc.)
- mon – Monitoring Server (nagios, sensu, etc.)
- prx – Proxy/Load Balancer (software)
- ssh – SSH Jump/Bastion Host
- sto – Storage Server