Write a program for FTP, TelNet, Ping or any other service in a minute
I wasted to collect sample code for communicating with FTP then Ping. When I compared both program, I found there is no difference between both program since they are just for connecting to specific service and were not doing anything extra. Only the single difference what i found is their port number.
See your self;
Write a program to communicate with FTP server
: Socket t = new Socket(hostname, 21); :
Write a program to ping a server
: Socket t = new Socket(hostname, 7); :
Good trick… isn’t it? So there is a list of well known ports which can help you to connect particular service on the server.
| 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 IP |
| 443 | HTTPS |
| 444 | Simple Network Paging Protocol (SNPP) |
| 445 | Microsoft-DS |
| 458 | Apple QuickTime |
| 546 | DHCP Client |
| 547 | DHCP Server |
| 563 | SNEWS |
| 569 | MSN |
| 1080 | Socks |
Besides this list, there is a list of some software which connects to specific port. If the port is not free or busy with another service then either that application will search for alternate port or will stop working.
You can refer the complete list on wikipedia.
Hey! this is Amit Gupta (amty). By profession, I am a Software Eng. And teaching is my passion. Sometimes I am a teacher, as you can see many technical tutorials on my site, sometimes I am a poet, And sometime just a friend of friends...