Port Numbers to Know

Question 1

What port number is used for Echo (Ping)?

Answer 1

Port 7 TCP/UDP

Question 2

What port number is used for Character Generator (CharGen)?

Answer 2

Port 19 TCP/UDP

Question 3

What ports are used for the File Transfer Protocol (FTP)?

Answer 3

Port 20 (Data) TCP/UDP
Port 21 (Control) TCP/UDP

Question 4

What port number is used for Secure Shell (SSH)?

Answer 4

Port 22 TCP/UDP

Question 5

What port number is used for Telnet?

Answer 5

Port 23 TCP/UDP

Question 6

What port number is used for Simple Mail Transfer Protocol (SMTP)?

Answer 6

Port 25 TCP/UDP

Question 7

What port number is used for Login Host Protocol (TACACS)?

Answer 7

Port 49 TCP/UDP

Question 8

What port number is used for Domain Name Servers (DNS)?

Answer 8

Port 53 TCP/UDP

Question 9

What port numbers are used for Dynamic Host Configuration Protocol (DHCP)?

Answer 9

Port 67 TCP/UDP

Port 68 TCP/UDP

Question 10

What port number is used for Trivial File Transfer Protocol (TFTP)?

Answer 10

Port 69 TCP/UDP

Question 11

What port number does Finger use?

Answer 11

Port 79 TCP/UDP

Question 12

What port number is for un-secure Web Pages (HTTP)?

Answer 12

Port 80 TCP/UDP

Question 13

What port number is used for Kerberos?

Answer 13

Port 88 TCP/UDP

Question 14

What port number is used for Post Office Protocol v3 (POP3)?

Answer 14

Port 110 TCP

Question 15

What port number is for Network News Transfer Protocol (NNTP)?

Answer 15

Port 119 TCP

Question 16

What port number does Simple File Transfer Protocol (SFTP) use?

Answer 16

Port 115 TCP

Question 17

What port number does Network Time Protocol (NTP) use?

Answer 17

Port 123 TCP/UDP

Question 18

What port is used for RPC?

Answer 18

Port 135 TCP/UDP

Question 19

What port does Simple Network Management Protocol (SNMP) use?

Answer 19

Port 161 UDP

Question 20

What port does Simple Network Management Protocol Trap (SNMPTrap) use?

Answer 20

Port 162 TCP/UDP

Question 21

What port is used for Internet Protocol Security/Internet Security Association and Key Management Protocol (IPSEC/ISAKMP)?

Answer 21

Port 500 TCP/UDP

Question 22

What port does the RADIUS Authentication Protocol use?

Answer 22

Port 1812 TCP/UDP

Question 23

What port does Yahoo Messenger use?

Answer 23

Port 5000 TCP/UDP

Question 24

What ports does NetBIOS use?

Answer 24

Port 137 TCP/UDP
Port 138 TCP/UDP
Port 139 (TLS/SSL)

Question 25

What port does the Lightweight Directory Access Protocol (LDAP) use?

Answer 25

Port 389 TCP/UDP

Question 26

What port does Lightweight Directory Access Protocol over TLS/SSL (LDAPS) use?

Answer 26

Port 636 TCP/UDP

Question 27

What port does the Internet Message Access Protocol (IMAP) use?

Answer 27

Port 143 TCP

Question 28

What port does Post Office Protocol v3 over TLS/SSL use?

Answer 28

Port 995 TCP

Question 29

What port does the Internet Message Access Protocol over TLS/SSL (IMAPS) use?

Answer 29

Port 993 TCP

Question 30

What port does secure web browsing (HTTPS) use?

Answer 30

Port 443 TCP/UDP

Question 31

What port does the Layer 2 Tunneling Protocol (L2TP) use?

Answer 31

Port 1701 UDP

Question 32

What port does the Point to Point Tunneling Protocol (PPTP) use?

Answer 32

Port 1723 TCP/UDP

Question 33

What port does the Remote Desktop Protocol (RDP) use?

Answer 33

Port 3389 TCP

Question 34

What port does SMTP over SSL Use?

Answer 34

Port 465 TCP