whatportis.com
suggest an edit →

Port 510FirstClass Protocol

FirstClass Protocol is a communication platform suite primarily used in educational institutions and businesses for email, collaboration, and messaging. It runs on a proprietary protocol that facilitates client-server interactions for groupware functionalities. Port 510 is traditionally utilized during server communication within FirstClass systems to enable seamless integration of messaging, conferencing, directory services, and administrative tasks..

inEmailNetwork Services
transport
tcp

single transport

in transit
cleartext

payload readable on path

assignment
unofficial

used by convention

risk
4/10

caution

lookups
5,668

rank 866 of 993 · top 87%

Technical Details

what runs on :510

FirstClass Protocol is a proprietary protocol implemented by Open Text Corporation, designed to support the FirstClass server and client applications. The protocol enables a comprehensive messaging and collaboration environment, offering email, conferencing, calendaring, and document management within a single platform. Communication between FirstClass clients and servers occurs primarily over TCP port 510.

The protocol operates using a custom client-server architecture, with persistent connections established via port 510 to exchange command sequences, synchronize messages, and provide real-time updates. Although originally designed for LAN deployments, FirstClass evolved to support internet-based connectivity, employing its distinct protocol stack atop TCP/IP networking.

Despite its age, FirstClass continues to be employed in legacy deployments owing to its robust feature set and low administrative overhead. However, detailed specifications of the proprietary FirstClass protocol are not publicly available, limiting third-party integration and reverse engineering efforts.

Security Information

exposure of :510

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

email averages 3.9 across 42 ports — this one sits 0.1 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

Common security vulnerabilities associated with FirstClass Protocol revolve mostly around:

  • Unencrypted Communications: Since it lacks inherent transport encryption, data transmitted over port 510 can be susceptible to eavesdropping and man-in-the-middle attacks.
  • Authentication Weaknesses: Older installations might use weak authentication schemes or default credentials.
  • Software Exploits: Vulnerabilities in outdated server software versions could allow remote compromise, arbitrary code execution, or denial-of-service attacks.

Mitigations typically include:

  • Encryption: Tunneling FirstClass communication through encrypted channels such as VPNs or implementing SSL/TLS if supported.
  • Access Controls: Limiting port exposure via network segmentation and strict firewall rules.
  • Updating Software: Ensuring that the latest security patches are applied to the FirstClass server.
  • Credential Management: Enforcing complex passwords, disabling unused accounts, and integrating with centralized authentication where possible.

Related Ports

all 42 in email →

the 8 most looked-up other ports in email — 42 ports carry that label.

portservicerisk
:143IMAPcaution
:995POP3Scaution
:109POP2caution
:2096cPanel SSL Webmailsafe
:110POP3caution
:993IMAPScaution
:1352Lotus Notes RPCcaution
:24Private Mailcaution

risk mix of the 8 listed

  • safe13%
  • caution88%

3 of 8 encrypted