port : Java Glossary

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port
The word port has at least three meanings:

TCP/IP UDP ICMP Ports

TCP/IP Ports
Port name Port number
echo, used for testing. 7
DayTime, returns date/time as a string. 13
FTP (File Transfer Protocol) 20 and 21
SMTP (Simple Mail Transfer Protocol) 25
Time, returns 32-bit days since 1900/01/01. 37
HTTP 80
DNS 53
POP3 (Post Office Protocol version 3) 110
NTP (Network Time Protocol)
64-bit number with 32 bits as the integer
and 32 bits as the fractional portion
of seconds since 1900/01/01.
123
utime 519
timed timeserver 525
SNTP (Simple Network Time Protocol) 580
dbAnywhere 8889
IN Windows Server 2003 you can find out which process in using which port with the Netstat -nao command.

Hardware Ports

At a hardware level are special registers called ports. When you write them you output to external I/O devices such as serial ports, parallel ports or hard disk controllers. When you read from them, you input from I/O devices.
Serial Port Assignments
com1: com2: com3: com4:
port: 3f8 2f8 3e8 2e8
irq: 4 3 4 3
Parallel Port Assignments
lpt1: lpt2: lpt3: LPT4: LPT5: LPT6: LPT7:
port: 3BC 378 278 368 268 358 258
irq: 7 5 ? ? ? ? ?
IANA list of TCP/IP Port Number Uses
UART: tool to check your serial port and IRQIRQ assignments

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