The Broadband Guide
search advanced
 forgot password?

Port 4242 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
4242 tcp trojans Virtual Hacking Machine (VHM) trojan

Nemog backdoor (discovered 2004.08.16) - a backdoor trojan horse that allows an infected computer to be used as an email relay and HTTP proxy, dropped by W32.Mydoom.Q@mm.
It can use one of the following ports: 3306,4242,4646,4661,6565,8080

Applications using this port: CrashPlan Cloud Backup, VRML Multi User Systems, Rag Doll Kung Fu (TCP/UDP), Orthanc - Default DICOM port, Reverse Battle Tetris, Quassel distributed IRC client

Stack-based buffer overflow in the parsePresentationContext function in storescp in DICOM dcmtk-3.6.0 and earlier allows remote attackers to cause a denial of service (segmentation fault) via a long string sent to TCP port 4242.
References: [CVE-2015-8979], [BID-94951], [XFDB-130495]
4242 tcp trojan [trojan] Virtual Hacking Machine - VHM Trojans
4242 tcp VirtualHackingMachine [trojan] Virtual Hacking Machine - VHM SANS
4242-4299 tcp,udp vrml-multi-use Multi User Systems SANS
4242 vrml vrml-multi-use Multi User Systems Neophasis
4242 tcp threat Nemog Bekkoame
4242 tcp,udp This port number is widely used on the net for MUDs (Multi-User-Dungeons), a type of chat system. It is also frequently used as an example port in code demonstrations or as an alternate HTTP port. The reason this is so popular is becuase it repeats the number 42, a popular number among computer geeks. In Douglas Adams classic book "Hitch Hikers Guide to the Galaxy", the number "42" is the answer to life, the universe, and everything. o This port is used (TCP) for a remote admin Trojan called "Virtual Hacking Machine". o This port is used for configuration for the Payline e-commerce package. o Connectix VideoPhone uses this port for something. o IBM's version of UNIX, AIX, has a C++ source browser (part of IBM's CSet package) that listens at this port and is susceptable to a buffer overflow. Bekkoame
4200-4299 tcp,udp vrml-multi-use VRML Multi User Systems IANA
8 records found
jump to:
previous next

Related ports: 3306  4201  4243  4646  4661  6565  8042  8080  

« back to SG Ports

External Resources
SANS Internet Storm Center: port 4242

Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol. TCP is the most commonly used protocol on the Internet and any TCP/IP network. Whereas the IP protocol deals only with packets, TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP.

UDP ports use the Datagram Protocol, a communications protocol for the Internet network, transport, and session layers. Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol) and makes possible the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received the message to process any errors and verify correct delivery. UDP is often used with time-sensitive applications, such as audio/video streaming, where dropping some packets is preferable to waiting for delayed data.

When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them. This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command. We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.

Please use the "Add Comment" button below to provide additional information or comments about port 4242.
  User Reviews/Comments:
by jonathanrb - 2013-02-15 13:31
Cloud backup software CrashPlan also uses TCP/4242 (and TCP/4243, but only locally between the client UI and service)

For more details, see:
(link valid on 2013-02-15)
by Levest28 - 2015-01-05 19:11
The online game "StarMade" uses port 4242 for connecting to and hosting servers, and will conflict with anything trying to use that port such as Crashplan as I've just figured out
by anonymous - 2017-03-22 12:18
Quassel IRC client's core also uses port 4242.
News Glossary of Terms FAQs Polls Cool Links SpeedGuide Teams SG Premium Services SG Gear Store
Registry Tweaks Broadband Tools Downloads/Patches Broadband Hardware SG Ports Database Security Default Passwords User Stories
Broadband Routers Wireless Firewalls / VPNs Software Hardware User Reviews
Broadband Security Editorials General User Articles Quick Reference
Broadband Forums General Discussions
Advertising Awards Link to us Server Statistics Helping SG About