- A port number is part of the addressing information used to identify the senders and receivers of messages. Port numbers are most commonly used with TCP/IP connections.
- Port numbers range is 0 to 65535, means total port numbers are 65536, The port number field is 16-bit size.So we get only 2^16(2 to the power of 16) ports , its equal to 65536 ports
- Default ports are 0 to 1023 (2^10=1024 ports), default ports means particular well known services such as ftp server, web server, mail server, dns server, samba server nfs server etc.., these servers are using default port numbers(dns=53, ftp=21, Apache=80, samba=139)
# vim /etc/services
Important Port Numbers :
PORT
|
NAME
|
COMMENT
|
1
|
tcpmux
|
TCP
Port Service multiplexer
|
7
|
echo
|
Echo
service
|
20
|
FTP Data
|
File
Transfer Protocol - For transferring FTP data
|
21
|
FTP Control
|
For
starting FTP connection
|
22
|
SSH
|
Secure
Shell
|
23
|
Telnet
|
For
insecure remote administration
|
25
|
SMTP
|
Send
Mail Transfer Protocol
|
43
|
WHOIS service
|
|
53
|
DNS
|
Domain
Name System
|
67
|
Bootp
|
Bootstrap
Protocol(DHCP-client to server communication)
|
68
|
DHCP
|
Dynamic
Host Configuration Protocol(Server to client communication)
|
69
|
TFTP
|
Trivial
file transfer protocol uses udp protocol for connection less transmission of
data
|
80
|
HTTP/WWW
|
Hypertext
Transfer Protocol/apache
|
88
|
Kerberos
|
Kerberos
is a computer network authentication protocol which works on the basis of
'tickets' to allow nodes communicating
|
110
|
POP3
|
Post
Office Protocol - Mail delivery Agent
|
111
|
Rpcbind
|
part
of the portmap package
|
123
|
NTP
|
Network
time protocol used for time syncing uses UDP protocol
|
137
|
NetBIOS(nmbd)
|
|
139
|
SMB-Samba(smbd)
|
SAMBA
Server
|
143
|
IMAP
|
Internet
Message Access Protocol
|
161
|
SNMP
|
Simple
Network Management Protocol - For network monitoring
|
389
|
LDAP
|
Lightweight
Directory Access Protocol - For centralized administration
|
443
|
HTTPS
|
HTTP+SSL
for secure web access
|
514
|
Syslogd
|
|
636
|
ldaps
|
LDAP
over SSL - both tcp and udp
|
873
|
Rsync
|
Remote
sync
|
989
|
FTPS-data
|
|
990
|
FTPS
|
Also
known as FTP-ES, FTP-SSL and FTP Secure
|
993
|
IMAPS
|
IMAP
Secure
|
995
|
POP3s
|
POP
over SSL
|
1194
|
openVPN
|
virtual
private network
|
1812
|
RADIUS
|
Remote
Authentication Dial In User Service
|
2049
|
NFS
|
Network
File System
|
2401
|
CVS server
|
Concurrent
Versioning System
|
3128
|
Squid Proxy
|
|
3306
|
MySql
|
Mysql
Database
|
3690
|
SVN
|
Apache
Subversion
|
8008
|
http-alt
|
Hypertext
Tranfer Protocol (HTTP) alternate
|
8080
|
Webcache
|
World
Wide Web(WWW) caching service
|
10000
|
Webmin
|
|
6000 -6063
|
X11
|
X11
use 6000 to 6063.. ports for connecting X11 from remote server
|
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