protocol.how|
Interactive network protocol simulator
Learn how network protocols work by typing real commands and seeing authentic responses. Select a protocol below to start exploring.
SMTP Application Port 25
Simple Mail Transfer Protocol - Used for sending emails
IMAP Application Port 143
Internet Message Access Protocol - Used for retrieving emails
POP3 Application Port 110
Post Office Protocol - Used for downloading emails
SSH Application Port 22
Secure Shell - Used for secure remote access
TELNET Application Port 23
Teletype Network - Basic remote terminal access
FTP Application Port 21
File Transfer Protocol - Used for transferring files
HTTP/1.1 Application Port 80
Hypertext Transfer Protocol - Used for web communication
- Type commands in the terminal and learn by experimenting and experience
- Each protocol simulator responds according to RFC specifications
- Note that SMTP sent emails are added to Outbox
- FTP supports authenticated and anonymous access
- IMAP & POP3 works against the mock email client
- No emails are sent, kept in virtual mail server / email client
- Email overview is for test@protocol.how mailbox
- Web content is served from the VFS path /var/www/html