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Home › Forums › Archives › Computer Support › Computer Support Discussion › DOS Question
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you can use telnet as a client for many protocols. all you need is the internet standard (usually in the form of an RFC) for the protocol you’re interested in. for some protocols using telnet is too much of a hassle because its too complicated. one protocol that is interesting and not too complicated is IRC. After you read the RFC you can start connecting to IRC servers that are very trusting of their users (ones that don’t expect you to CTCP reply within one second of connecting/etc). lots of open protocols/ Internet Standards have RFCs written for them. Request for Comments archives are available for your reading pleasure.
21 can be used for FTP
25 can be used to send email via SMTP
80 can be used for HTTP
these are just some of the many examples. there are probably updated specifications available. remember that the servers you connect to might not support some of the commands you type.
Also, just because someone is listening on a specific port doesn’t mean that they are also listening for connections for the corresponding protocol. They could be listening for IRC on 80 or HTTP on 194. Here’s a list of services that would most likely be listening for connections on the corresponding ports. This file is usually available on unix/linux/macosx systems at /etc/services
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