1
Q
Port 23
A
Telnet
2
Q
Port 25, 465
A
Simple Mail Transfer Protocol (SMTP)
3
Q
Port 49
A
TACACS
4
Q
Port 53
A
DNS
5
Q
Port 67, 68
A
DHCP or Boot P
6
Q
Port 69
A
TFTP
7
Q
Port 88
A
Kerberos
8
Q
Port 110
A
Pop 3
9
Q
Port 119
A
Network News Transfer Protocol (NNTP)
10
Q
Port 123
A
NTP
11
Q
Port 137,138,139
A
Net Bios
12
Q
Port 143
A
IMAP
13
Q
Port 161, 162
A
SNMP (Simple Network Manag Protocol)
14
Q
Port 389
A
LDAP
15
Q
Port 445
A
SMB
16
Q
Port 500
A
IKE
17
Q
Port 636
A
LDAPS
18
Q
Port 989, 990
A
FTPS
19
Q
Port 1433
A
SQL
20
Q
Port 1701
A
L3TP or L2F
21
Q
Port 1720
A
H323
22
Q
Port 1812, 1813
A
RADIUS
23
Q
Port 2427, 2727
A
Media Gateway Control Protocol (MGCP)
24
Q
Port 3389
A
(RDP) Remote Desktop Protocol
25
Port 5004, 5005
RTP
26
Port 5060, 5061
SIP
27
Ports 0 - 1023
Well-known or System ports
28
1024 - 49151
Registered ports
29
49152 - 65535
Dynamic, private or ephemeral ports
Network Ports
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