Port Number Description 1 TCP Port Service Multiplexer (TCPMUX) 5 Remote Job Entry (RJE) 7 ECHO 18 Message Send Protocol (MSP) 20 FTP -- Data 21 FTP -- Control 22 SSH Remote Login Protocol 23 Telnet 25 Simple Mail Transfer Protocol (SMTP) 29 MSG ICP 37 Time 42 Host Name Server (Nameserv) 43 WhoIs 49 Login Host Protocol (Login) 53 Domain Name System (DNS) 69 Trivial File Transfer Protocol (TFTP) 70 Gopher Services 79 Finger 80 HTTP 103 X.400 Standard 108 SNA Gateway Access Server 109 POP2 110 POP3 115 Simple File Transfer Protocol (SFTP) 118 SQL Services 119 Newsgroup ( NNTP ) 137 NetBIOS Name Service 139 NetBIOS Datagram Service 143 Interim Mail Access Protocol (IMAP) 150 NetBIOS Session Service 156 SQL Server 161 SNMP 179 Border Gateway Protocol (BGP) 190 Gateway Access Control Protocol (GACP) 194 Internet Relay Chat (IRC) 197 Directory Location Service (DLS) 389 Lightweight Directory Access Protocol (LDAP) 396 Novell Netware over
No matter how sophisticated the technology is , It still takes people !