port number table TCP – IP Ports list | These are numbers used by certain protocols of application layer. Each common protocols are allocated a unique ports . IANA is responsible for assignment of port numbers. Custom ports are also allocated to vendors by the regulatory authorities. Here are the list of important TCP -IP ports commonly used HTTP ———- 80 FTP ———— 20,21   TelNet ———- 23   SMTP ———- 25   DNS ———– 53   TFTP ———– 69   SNMP ———- 161   RIP ————- 520   IMAP 4——— 143   IMAP 3 ——— 220   RPC ———— 135   LDAP ———- 389   Net Stat ——– 15   WINS ———- 42   BootP ———- 67   DHCP ———- 68   POP2 ———- 109   POP3 ———- 110   Net BIOSRead More →