T
T
TODO•SEC
Search…
Top 1000 Well Known Ports
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
9
Yes
Yes
Official
Yes
No
Yes
Unofficial
11
Yes
Yes
Official
Active Users (systat service)
13
Yes
Yes
Official
15
Yes
No
Unofficial
Previously netstat servic
17
Yes
Yes
Official
18
Yes
Yes
Official
19
Yes
Yes
Official
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
42
Assigned
Yes
Official
Copy link