What is telnet-online?

Telnet online is a service through which you can connect to hosts and communicate with them, checking the operability and proper configuration of the services started there. The service is essentially an analog of the telnet application for windows with which you can check the port online.

Also you can             
                    
  • Test your server performance
  •                 
  • Check whether the port is open on the server
  •                 
  • Run the ping. Ping online.
  •                 
  • Run traceroute. Traceroute online.
  •                 
  • Calculate sha1 online
  •                 
  • Calculate md5 online
  •                 
  • idn_to_utf8 online
  •                 
  • idn_to_ascii online which are engaged in converting local domain names into punycode ONLINE!!!
  •             
                         

idn_to_utf8 / idn_to_ascii

                         

                IDN (Internationalized Domain Names) - the standard for transcoding domain names in the DNS system, containing local symbols.                 Here you can use the function idn to ascii converter online.             

                         

                IDN The record can be recorded in two different ways:             

                
                        
  • unicode format - the domain name is written with local Unicode characters, for example, russia.rf
  •                     
  • ACE format (ASCII Compatible Encoding) - the domain name is written with ASCII characters (xn - h1alffa9f.xn - p1ai)                 
                             

                Punycode is an algorithm that describes the conversion of Unicode characters to ACE format.                 

                

To re-encode the domain name from the punycode format (xn-h1alffa9f.xn-p1ai) to the national (russia.rf), use the command idn_to_utf8

                                 

To get the punycode (xn-h1alffa9f.xn-p1ai) representation on behalf of the domain in the national format (russia.rf) - use the command idn_to_ascii

Tips

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
    quit
  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>
<enter>

How to request a page from an HTTP server

            

To see the raw response from the http server, get the contents of the html page online - execute the following commands

Open site.ru 80 & lt; enter & gt;
GET http://www.site.ru/news.html HTTP / 1.0 & lt; enter & gt;
Host: www.site.ru & lt; enter & gt;
Referer: http://www.site.ru/index.html<enter>
Cookie: income = 1 & lt; enter & gt;
                                      

How to ping the server (ping online)

            

To check the availability of the server using the online ping service. In the input field where type is written - enter ping yandex.ru to ping the server online

            

In response, you'll get something like

                         
PING yandex.ru (77.88.55.88) 56 (84) bytes of data.
64 bytes from yandex.ru (77.88.55.88): icmp_seq = 1 ttl = 58 time = 34.8 ms
64 bytes from yandex.ru (77.88.55.88): icmp_seq = 2 ttl = 58 time = 34.9 ms
64 bytes from yandex.ru (77.88.55.88): icmp_seq = 3 ttl = 58 time = 34.8 ms

--- yandex.ru ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
Rtt min / avg / max / mdev = 34.800 / 34.882 / 34.964 / 0.066 ms
            
                         

Such a response indicates a successful PING

                                      
PING your-server.com (23.23.174.132) 56 (84) bytes of data.

--- your-server.com ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 1999ms
            
                         

This answer on the contrary says that the server does not respond to the ping. The server may be unavailable or the ping option is closed.

                         

How to connect to the port via telnet

            

Write 25 [ENTER] in the input field of open server.com to connect to the server - server.com and port 25. Next, you begin to communicate directly with the software that accepts connections on the specified port. In our case, this is an SMTP port (25) and it means there will be some kind of mail program. How to send a message directly through the SMTP server can be read above.

                         

How to check if the port is open on the server

            

To check the port availability on the server - type the command in the (type here) field open server.com 666 [ENTER] to connect to the server named "server.com" and port 666

                         

If in return you received something like             
            Connection to server.com:666 - fail
            Error # 110 (Connection timed out)
            
                         Then port 666 on this server is closed.                          

            

If you successfully connect, you will receive a message Connection to server.com:666 - ok

        Tips

How to check the sending email?


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  
   
Enter the command  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  
   
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  
Specify the destination (myclient@yandex.ru):   rcpt to: mailto@mail.ru   250 2.1.5 ivan ... Recipient ok  
Enter the command   data   354 Enter mail, end with "." on a line by itself  
Subject: topic writing test   
text of the letter,  and finally writing a single point in a row to finish  .   
250 2.0.0 x2789MjQ008048 Message accepted for delivery  
Enter to exit   quit   
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 
GET http://www.site.ru/news.html HTTP/1.0 
Host: www.site.ru 
Referer: http://www.site.ru/index.html 
Cookie: income=1 
 



 How to request a page from an HTTP server 
             To see the raw response from the http server, get the contents of the html page online - execute the following commands 
Open site.ru 80 & lt; enter & gt; 
GET http://www.site.ru/news.html HTTP / 1.0 & lt; enter & gt; 
Host: www.site.ru & lt; enter & gt; 
Referer: http://www.site.ru/index.html 
Cookie: income = 1 & lt; enter & gt; 
            
            
How to ping the server (ping online) 
To check the availability of the server using the online ping service. In the input field where type is written - enter  ping yandex.ru  to ping the server online 
In response, you'll get something like 
            
            
PING yandex.ru (77.88.55.88) 56 (84) bytes of data.
64 bytes from yandex.ru (77.88.55.88): icmp_seq = 1 ttl = 58 time = 34.8 ms
64 bytes from yandex.ru (77.88.55.88): icmp_seq = 2 ttl = 58 time = 34.9 ms
64 bytes from yandex.ru (77.88.55.88): icmp_seq = 3 ttl = 58 time = 34.8 ms

--- yandex.ru ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
Rtt min / avg / max / mdev = 34.800 / 34.882 / 34.964 / 0.066 ms
            
Such a response indicates a successful PING 
            
PING your-server.com (23.23.174.132) 56 (84) bytes of data.

--- your-server.com ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 1999ms
            
            
This answer on the contrary says that the server does not respond to the ping. The server may be unavailable or the ping option is closed. 
            
How to connect to the port via telnet 
Write 25 [ENTER] in the input field of open server.com to connect to the server - server.com and port 25. Next, you begin to communicate directly with the software that accepts connections on the specified port. In our case, this is an SMTP port (25) and it means there will be some kind of mail program. How to send a message directly through the SMTP server can be read above. 
            
How to check if the port is open on the server 
To check the port availability on the server - type the command in the (type here) field open server.com 666 [ENTER] to connect to the server named "server.com" and port 666 
            
If in return you received something like
            
Connection to server.com:666 - fail 
Error # 110 (Connection timed out) 
            
Then port 666 on this server is closed.

If you successfully connect, you will receive a message  Connection to server.com:666 - ok