Port 203

Modified by:

Port 203 is typically used for the AppleTalk Zone Information Protocol (ZIP) in the AppleTalk networking protocol suite. This port allows devices in an AppleTalk network to exchange information about the zones (logical groups of network devices) they belong to. However, this protocol has become obsolete, and the use of Port 203 has declined rapidly.

Ports those registered with IANA are shown as official ports. The same port number may be unofficialy used by various services or applications. The official usage are listed separately below its usage may change from time to time.

Official

Port
Protocol (TCP/UDP)
Title
Description
Port Type
Port 203
tcp
at-3
AppleTalk Unused
WELL KNOWN PORT
Port 203
udp
at-3
AppleTalk Unused
WELL KNOWN PORT

UnOfficial

Unofficialy or sometimes with conflict, the same port may be used by different applications.

Port Protocol (TCP/UDP) Description
TCP UDP Ports
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Ports those registered with IANA are shown as official ports. The same port number
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Ports 17700 – 17800
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