Top 1000 Well Known Ports

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https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers

Port
TCP
UDP
IANA status
Description
SCTP
0
Reserved
Reserved
Official
​
​
N/A
N/A
Unofficial
In programming APIs (not in communication between hosts), requests a system-allocated (dynamic) port
​
​
1
Yes
Assigned
Official
​TCP Port Service Multiplexer (TCPMUX). Historic. Both TCP and UDP have been assigned to TCPMUX by IANA, but by design only TCP is specified.
​
5
Assigned
Assigned
Official
​Remote Job Entry was historically using socket 5 in its old socket form, while MIB PIM has identified it as TCP/5 and IANA has assigned both TCP and UDP 5 to it.
​
7
Yes
Yes
Official
​Echo Protocol​
​
9
Yes
Yes
Official
​Discard Protocol​
Yes
No
Yes
Unofficial
​Wake-on-LAN​
​
​
11
Yes
Yes
Official
Active Users (systat service)
​
13
Yes
Yes
Official
​Daytime Protocol​
​
15
Yes
No
Unofficial
Previously netstat servic
​
17
Yes
Yes
Official
​Quote of the Day (QOTD)
​
18
Yes
Yes
Official
​Message Send Protocol​
​
19
Yes
Yes
Official
​Character Generator Protocol (CHARGEN)
​
20
Yes
Assigned
Official
​File Transfer Protocol (FTP) data transfer
Yes
21
Yes
Assigned
Official
​File Transfer Protocol (FTP) control (command)
Yes
22
Yes
Assigned
Official
​Secure Shell (SSH), secure logins, file transfers (scp, sftp) and port forwarding
Yes
23
Yes
Assigned
Official
​Telnet protocol—unencrypted text communications
​
25
Yes
Assigned
Official
​Simple Mail Transfer Protocol (SMTP), used for email routing between mail servers
​
37
Yes
Yes
Official
​Time Protocol​
​
42
Assigned
Yes
Official
​Host Name Server Protocol​
​

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