7 echo (PING)

9 discard

13 day timer

19 character generator

20 FTP data

2 1 FTP control

23 Remote login

Simple mail transfer protocol (SMTP)

53 domain name server

70 gophers

80 WWW

100 post office protocol, POP)

1 19 New Network Transport Protocol (NNTP)

139 NetBIOS session service (NBSession)

636 lightweight directory access protocol (lightweight directory access protocol

、LDAP)

1080 socks

UDP port number description

7 echo (PING)

9 discard

13 day timer

19 character generator

69 Daily File Transfer Protocol (TFTP)

137 NetBIOS name service, Nbname)

138 NetBIOS datagram service (NBDatagram)

16 1 Simple Network Management Protocol (SNMP)

Simply put, it's much more than that.