Is port 104 (DICOM) dangerous?

Port 104 is classified as critical risk and should not be exposed to the public internet. It transmits data without encryption, making it vulnerable to eavesdropping and credential theft.

Should port 104 be open on my firewall?

No, port 104 should not be open to the public internet. Block it at the firewall and use encrypted alternatives such as SSH, SFTP, or HTTPS instead.

What transport protocol does port 104 use?

Port 104 (DICOM) uses the TCP transport protocol and falls under the Other category.

:104 (TCP)

DICOM

Critical Risk

TCP — Other

Port Overview

Port Number 104

Service Name DICOM

Transport Protocol TCP

Category Other

Security Risk Critical

Port Range Well-Known (0-1023)

What is Port 104?

DICOM (Digital Imaging and Communications in Medicine) is the international standard for medical imaging data exchange, used by CT scanners, MRI machines, PACS systems, and radiology workstations. Exposed DICOM services have been a significant healthcare security issue.

TCP Other Commonly Used

Security Considerations

Port 104 (DICOM) is classified as critical risk. This port should not be exposed to the public internet. The service transmits data without encryption, making it vulnerable to eavesdropping, credential theft, and man-in-the-middle attacks.

Recommendation: Block this port at the firewall. Use encrypted alternatives (SSH, SFTP, HTTPS) instead.

Related Ports — Other

35 Private Printer Server 43 WHOIS 63 Whois++ 75 Private Dial-Out Service 78 VetTCP 91 MIT-DOV 92 NPP 105 CCSO Nameserver

Related Terms

ASN BGP Hijack Data Center Domain Name Dual Stack Internet Exchange Point (IXP)