| ID | Port Number | Protocol | Description |
|
1
|
20
|
TCP
|
FTP Data
|
|
2
|
21
|
TCP
|
FTP
|
|
3
|
22
|
TCP
|
SSH, SFTP, SCP
|
|
4
|
23
|
TCP
|
Telnet
|
|
5
|
25
|
TCP
|
SMTP (Simple Mail Transfer Protocol)
|
|
6
|
53
|
TCP/UDP
|
DNS (Domain Name System)
|
|
7
|
67
|
UDP
|
DHCP Server
|
|
8
|
68
|
UDP
|
DHCP Client
|
|
9
|
69
|
UDP
|
TFTP (Trivial File Transfer Protocol)
|
|
10
|
80
|
TCP
|
HTTP (HyperText Transfer Protocol)
|
|
11
|
110
|
TCP
|
POP3 (Post Office Protocol v3)
|
|
12
|
115
|
TCP
|
SFTP (Simple File Transfer Protocol)
|
|
13
|
123
|
UDP
|
NTP (Network Time Protocol)
|
|
14
|
143
|
TCP
|
IMAP (Internet Message Access Protocol)
|
|
15
|
161
|
UDP
|
SNMP (Simple Network Management Protocol)
|
|
16
|
162
|
UDP
|
SNMP Trap
|
|
17
|
443
|
TCP
|
HTTPS (HTTP Secure)
|
|
18
|
465
|
TCP
|
SMTPS (SMTP Secure)
|
|
19
|
587
|
TCP
|
SMTP (with STARTTLS)
|
|
20
|
993
|
TCP
|
IMAPS (IMAP Secure)
|
|
21
|
995
|
TCP
|
POP3S (POP3 Secure)
|
|
22
|
3306
|
TCP
|
MySQL
|
|
23
|
3389
|
TCP
|
RDP (Remote Desktop Protocol)
|
|
24
|
5432
|
TCP
|
PostgreSQL
|
|
25
|
5900
|
TCP
|
VNC (Virtual Network Computing)
|
|
26
|
6379
|
TCP
|
Redis
|
|
27
|
8080
|
TCP
|
HTTP Alternative
|
|
28
|
8443
|
TCP
|
HTTPS Alternative
|