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_utf8 and idn_to_ascii functions online. This functions convert domain names from and to punycode. We have ping online feauture, traceroute online sha1, md5 hash calculate online


How to check the sending email?

  1. command to log on to the mail server:
    open smtp.mail.ru 25
    Trying aaa.bbb.ccc.ddd ...
    Connected to smtp.mail.ru (aaa.bbb.ccc.ddd).
    Escape character is '^]'.
    220 smtp.mail.ru 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 smtp.mail.ru Hello smtp.mail.ru [aaa.bbb.ccc.ddd] pleased to meet you
  4. Specify sender address (must be in the same domain as the mail server: mail.ru)
    mail from: taras@gmail.com
    250 2.1.0 ivan @ mail.ru ... Sender ok
  5. Specify the destination (myclient@yandex.ru):
    rcpt to: mailto@mail.ru
    250 2.1.5 ivan ... 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 smtp.mail.ru closing connection
    Connection closed by foreign host.

How to get the page by HTTP request to server

To see the raw response from the server http, get the contents of the html pages online - use the following command open site.ru 80<enter>
GET http://www.site.ru/news.html HTTP/1.0<enter>
Host: www.site.ru<enter>
Referer: http://www.site.ru/index.html<enter>
Cookie: income=1<enter>


- telnet        Opens telnet connection to host / port. After connecting you can send command directly to server.
                            for terminate connection use 'exit' or 'close'
- ping host.com           Ping online some host using latin or local symbols.
- traceroute host.com     Traceroute online 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_utf8             idn_to_utf8 online converter
- whois          online whois tool to show info about host or ip