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Port 5938TeamViewer

TeamViewer is a widely-used remote access and desktop sharing application that enables users to connect to and control remote computers over the internet with minimal configuration. It facilitates secure remote support, collaboration, and file transfer between systems across various platforms..

inRemote AccessNetwork Services
transport
tcp · udp

2 transports registered

in transit
cleartext

payload readable on path

assignment
unofficial

used by convention

risk
4/10

caution

lookups
65,022

rank 15 of 993 · top 1%

Technical Details

what runs on :5938
  • Overview:

TeamViewer primarily facilitates remote desktop control, online meetings, and file transfer. It leverages centralized TeamViewer servers for connection brokering, enabling easy NAT and firewall traversal.

  • Communication:

By default, TeamViewer clients initiate outbound connections to the TeamViewer cloud infrastructure on port 5938/TCP & UDP, which is optimized for performance and stability. This port enables the primary communication channel for controlling and viewing remote desktops. If this port is unavailable, TeamViewer falls back to TCP/443 or TCP/80, allowing seamless operation in restrictive network environments.

  • Protocols & Fallback:

While port 5938 is preferred due to enhanced data transmission efficiency, fallback mechanisms ensure connectivity even when security policies block the dedicated port. TeamViewer uses proprietary protocols over this port, encapsulating remote display data, input control commands, and ancillary features like file transfer and chat.

Security Information

exposure of :5938

risk score

4/ 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 level with it.

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 · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

  • Common Vulnerabilities:

    • Exposure of port 5938 may allow an attacker to identify TeamViewer usage which could be leveraged in social engineering or targeted phishing campaigns.
    • If outdated or improperly configured, TeamViewer installations could be vulnerable to unauthorized access, credential brute-forcing, or exploitation of past software flaws.
    • Teams relying on default or weak passwords increase susceptibility to compromise.

  • Mitigations:

    • Enforce strong, unique passwords and enable two-factor authentication (2FA) on TeamViewer accounts.
    • Regularly update the software for patches addressing vulnerabilities.
    • Limit TeamViewer usage through access control policies and restrict which endpoints can use outbound port 5938.
    • Implement logging and monitoring of remote access sessions for anomaly detection.
    • Where possible, configure TeamViewer to use whitelist access controls and disable features not needed (e.g., file transfer).

Related Ports

all 110 in remote access →

the 8 most looked-up other ports in remote access — 110 ports carry that label.

portservicerisk
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:8008IBM HTTP Server Admincaution
:135Microsoft EPMAPcaution
:23Telnetcaution
:5800VNC over HTTPcaution

risk mix of the 8 listed

  • safe13%
  • caution88%

0 of 8 encrypted