TRENDnet Bluetooth R91007G - Manual (Page 44)

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The FTP port configuration screen will show default settings of FTP port 21, and
a passive port range of 50000 to 50100. These values can be modified if unique
ports are desired. Allowed port numbers are 1 through 65534. Many ports have
standard uses such as port 80 for HTTP and port 443 for secure HTTP (HTTPS);
be careful when choosing alternate ports. Ports in the range of 49152 to 65534
are reserved for dynamic use and are fairly safe to use. Click the next button
when finished selecting FTP ports.