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Telnet
Самый широкоизвестный и просто способ – с поомщью telnet:
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$ telnet example.com 80
Trying 93.184.216.34…
Connected to example.com.
Escape character is ‘^]’.
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NetCat
Другой вариант – NetCat (nc), больше возможностей:
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$ nc -zv example.com 80 Warning: Inverse name lookup failed for `93.184.216.34' example.com [93.184.216.34] 80 (http) open
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