PORTS NUMBERS : Just as the physical address (MAC address) and the logical address (IP address) helps to route the traffic to a particular machine on a network, it is the port that identifies which service on the machine this traffic is destined to.
List of ports : /etc/services
A port on a specific computer is called a socket. It can be open, closed, listening or have a connection established.
###Important PORT NUMBERS to remember:
20 - FTP - data transfer
21 - FTP - control (command)
22 - SSH
23 - Telnet
25 - SMTP
37 - Time
43 - WHOIS
42 - WINS
53 - DNS
67 - BOOTp
68 - DHCP
69 - TFTP
79 - FINGER
80 - HTTP (WWW)
88 - Kerberose
101 - HOSTNAME
110 - POP3
111 - rpcbind
119 - NNTP
123 - NTP (Time)
137 - NetBios (nmbd)
139 - NetBios ( Samba)
143 - IMAP/Dovecot
161 - SNMP
180 - RIS
220 - IMAP3
389 - LDAP
443 - HTTPs
500 - Internet Key Exchange (IKE), IPSec
520 - RIP
546 - DHCPV6 client
547 - DHCPV6 server
554 - rtsp(Real Time Stream Protocol, Audio/Video)
631 - Printing (ipp)
744 - Flexlm
901 - SWAT
953 - rndc
993 - IMAPSecure
995 - POPs
999 - POP over SSL/TLS
2049 - NFS
2082 - CPANEL
2083 - CPANEL Secure SSL/TLS
2086 - CPANEL WHM
2087 - CPANEL WHM Secure/SSL
2095 - CPANEL Webmail
2096 - CPANEL Webmail Secure/SSL
2222 - Direct Admin Control Panel
2401 - CVSP server
3268 - AD Global Catalog
3269 - AD Global Catalog over SSL
3306 - MySQL Server
3389 - Terminal services (rdp-remote desktop protocol)
4643 - Virtusso Power Panel
(6000 - X11
6063)
8443 - Pleask Control Panel
9999 - Urchin
10000- Webmin Control Panel
21018- Skype
TAG: port, portnumber, port-numbers, tcp, udp, network, service, services, linux, socket, communication, transmission, dataflow, rhce, ubuntu, unix, red hat, red-hat, redhat
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