Network protocols
What is a port number? Ports are standardized across all network-connected devices, with each port assigned a number.
Electronic Mail protocols #Email
#dns 53
#pop3 110
#imap 143
#dhcp 67
Network protocols #known port numbers
#Telnet 23
#SSH22
#LDAP389,636
#SNMP161,162
RDP 3389
Most ports are reserved for certain protocols — for example, all Hypertext Transfer Protocol (HTTP) messages go to port 80.
Port 25 is the default SMTP port that is used to enable communication between the sending and receiving servers when delivering an email message to a recipient. Despite its pedigree, many ISPs (Internet Service Providers) and email providers have started to block incoming connections on port 25 as a security measure
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