Protocol and port number

Protocol :-
   In information technology, a protocol is the special set of rules that end points in a telecommunication connection use when they communicate. Protocols specify interactions between the communicating entities.

Protocol                                                                          Port number

File Transfer Protocol (F.T.P.)                                                               21
Secure Shell (S.S.H.)                                                                             22
Telnet (Remote login service)                                                               23
Simple Mail Transfer Protocol (S.M.T.P.)                                             25
Domain Name System (D.N.S.)                                                             53
Hyper Text Transfer Protocol (HTTP)                                                  80
Post Office Protocol(POP3)                                                                 110
Network News Transfer Protocol (N.N.T.P.)                                      119
Network Time Protocol (N.T.P.)                                                          123
Internet Message Access Protocol (I.M.A.P.)                                      143
Simple Network Management Protocol (S.N.M.P.)                             161
Internet Relay Chat (I.R.C.)                                                                 194
HTTP Secure                                                                                       443