Internet-Security.com TCP port 33890 details

There is no IANA-assigned service for TCP 33890, but in practice it’s commonly used for Microsoft Remote Desktop Protocol (RDP) when admins change the default port 3389.
Real-world example: Windows Remote Desktop Services on Windows Server/Windows 10/11 are often configured to listen on 33890.
Internet scan platforms (e.g., Shodan, Censys) regularly show hosts on 33890 presenting RDP banners, including from Windows RDP and xrdp deployments.
Some organizations deliberately choose 33890 for RDP to reduce noise from default-port scans, though it does not add security.
The port is associated with exploitation: attackers and botnets routinely scan and brute-force RDP on nonstandard ports (including 33890), and such exposures are a common entry point for ransomware intrusions.

TCP 33890