PORTS

PORTS - In TCP/IP and UDP networks, a port is an endpoint to a logical connection and the way a client program specifies a specific server program on a computer in a network.

Some ports have numbers that are pre-assigned to them by the IANA (Internet Assigned Numbers Authority), and these are known as well-known ports (specified in RFC 1700).

Port numbers range from 0 to 65536, but only ports numbers 0 to 1024 are reserved for privileged services and designated as well-known ports. This list of well-known port numbers specifies the port used by the server process as its contact port.

WELL KNOWN PORT Numbers

15 Netstat
20/21 FTP
22 S/FTP
22 SSH
22 SCP
23 Telnet
25 SMTP
37 Time Protocol
43 Whois
49 TACACS+
50/500/4500 IPSec
53 DNS
67/68 BOOTP/DHCP
69 TFTP
79 Finger
80 HTTP
88 Kerberos
88 EIGRP
89 OSPF
110 POP3
111 Port Map
119 NNTP
123 NTP
137-139 NetBIOS
143 IMAP4
156 SQL Service
161 SNMP
162 SNMP Trap
179 BGP
389 LDAP
401 UPS
443 SSL
445 SMB
500 IPSec/ISAKMP
520 RIP
546/547 DHCP
587 SMTP/S
636 SLDAP
990 FTP/S
993 IMAP4/S
995 POP3/S
1433/1434 SQL
1512 WINS
1701 L2TP
1720 H.323
1723 PPTP
1812/1813 RADIUS
3389 RDP
5004/5005 RTP
5060/5061 SIP
5900 VNC