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Port 8383 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
8383 tcp imail www IPSwitch IMail admin port, IPSwitch IMail http frontend

IPSwitch IMail is an e-mail server which provides WWW (HTTP) E-mail services. By default this web service resides on port 8181 (TCP/UDP) or 8383 (TCP/UDP). Sending an HTTP request with an extremely long "HOST" field multiple times can cause the system hosting the service to become unresponsive. Each long request "kills" a thread without freeing up the memory used by it. By repeating this request, the system's resources can be used up completely.
References: [BID-2011]
8383 tcp,udp m2mservices M2m Services IANA
8383 tcp imail www IPSwitch IMail admin port SANS
8383 tcp imail-http IPSwitch IMail http frontend Neophasis
8383 tcp,udp threat IpSwitch's IMail program has a administrative web server running on this port. Bekkoame
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Related ports: 8181  

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External Resources
SANS Internet Storm Center: port 8383

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.

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