Try - open It's open a telnet connection to host / port. After opening a connection you can send command directly to server. - ping Ping some host using latin or local symbols. - traceroute Traceroute to host using latin or local symbols. - sha1 Get SHA-1 hash of some string - md5 Get MD5 Hash of string - idn_to_ascii idn_to_ascii online converter - idn_to_unicode idn_to_unicode online converter to close the connection use 'exit' or 'close'

What is telnet-online?

Telnet is a service online, first of all, perhaps, for system administrators or programmers. Using telnet-online, you can connect to hosts and communicate with them by checking the correct operation and configuration services.

Also you can calculate sha1 or md5 hash of random string. And now you can use idn_to_unicode and idn_to_ascii functions online. This functions convert domain names from and to punycode.


How to check the sending email?

  1. command to log on to the mail server:
    open 25
    Trying aaa.bbb.ccc.ddd ...
    Connected to mail.server. ua (aaa.bbb.ccc.ddd).
    Escape character is '^]'.
    220 ESMTP Sendmail xyz / xyz; Fri, 7 Mar 2008 10:09:22 +0200
  2. Enter the command
  3. greeting: helo eee.fff.ggg.hhh
    (where eee.fff.ggg.hhh your IP-address from which you are running the telnet)
    250 mail. Hello [aaa.bbb.ccc.ddd] pleased to meet you
  4. Specify sender address (must be in the same domain as the mail server:
    mail from:
    250 2.1.0 taras @ ... Sender ok
  5. Specify the destination (
    rcpt to:
    250 2.1.5 taras ... Recipient ok
  6. Enter the command
  7. data
    354 Enter mail, end with "." on a line by itself
  8. Subject: topic writing test
  9. text of the letter,
    and finally writing a single point in a row to finish
  10. 250 2.0.0 x2789MjQ008048 Message accepted for delivery
  11. Enter to exit
  12. 221 2.0.0 closing connection
    Connection closed by foreign host.

How to get the page by HTTP request to server

open 80<enter>
GET HTTP/1.0<enter>
Cookie: income=1<enter>