Port 3899Remote Administrator
Port 3899 is primarily associated with Remote Administrator (Radmin), a remote desktop software suite by Famatech. It provides tools for remote management, technical support, and system administration, allowing administrators to securely control and access remote computers over a network or the internet..
- transport
- tcp
- in transit
- cleartext
- assignment
- unofficial
- risk
- 5/10
- lookups
- 20,617
single transport
payload readable on path
used by convention
caution
rank 118 of 993 · top 12%
Technical Details
what runs on :3899-
Overview: Port 3899 is commonly used by Remote Administrator (Radmin), a remote access and control software for Windows systems. The software facilitates full control, file transfer, text chat, and system management functions, allowing administrators or support staff to interact with remote endpoints efficiently.
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Communication Protocols: Traditionally, Radmin operates over TCP port 3899, relying on a proprietary protocol optimized for low latency and effective compression. It does not utilize standard protocols like RDP or VNC, differentiating it from other remote access tools. Since it is unofficially assigned, some deployments may customize this port.
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Deployment Considerations: Remote Administrator can be employed in LANs or over the internet, often configured with IP address restrictions or integrated with authentication methods to regulate access. Given its nature as remote control software, it necessitates careful configuration to prevent unauthorized use, especially when accessible externally.
Security Information
exposure of :3899risk score
5/ 10caution
worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.
remote access averages 4.0 across 110 ports — this one sits 1.0 above.
in transit
cleartext
credentials and payloads are readable by anyone on path
assignment
unofficial
used by convention, not registered — what answers here varies by deployment
reachable over
tcp
every listening transport is another surface to filter at the edge
security overview
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Common Vulnerabilities:
- Unauthorized access due to weak passwords or default credentials.
- Exposure of the port to the open internet, increasing attack surface.
- Lack of encryption in communications can potentially allow eavesdropping and man-in-the-middle attacks.
- Exploits targeting legacy versions with known security flaws.
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Common Mitigations:
- Enforce strong password policies and change any default credentials.
- Restrict port access with firewalls or VPNs to trusted IP ranges only.
- Upgrade to the latest patched version of Radmin utilizing encrypted communications.
- Employ network segmentation to isolate critical systems using this port.
- Monitor for unauthorized access attempts and implement multi-factor authentication where possible.
Related Ports
the 8 most looked-up other ports in remote access — 110 ports carry that label.
| port | service | risk | |||
|---|---|---|---|---|---|
| :8000 | Intel Remote Desktop / Alternate HTTP Port | TCP | Web Services | safe | 84.3k |
| :8888 | D2GS Admin Console | TCP | Remote Access | caution | 83.7k |
| :8881 | Atlasz Secure Server | TCP | Web Services | caution | 67.6k |
| :5938 | TeamViewer | TCPUDP | Remote Access | caution | 65.0k |
| :8291 | Winbox MikroTik Admin | TCP | Security | caution | 62.9k |
| :8008 | IBM HTTP Server Admin | TCP | Web Services | caution | 58.3k |
| :135 | Microsoft EPMAP | TCPUDP | Security | caution | 51.9k |
| :23 | Telnet | TCP | Remote Access | caution | 34.8k |
risk mix of the 8 listed
- safe13%
- caution88%
0 of 8 encrypted