Network Ports Flashcards
21
TCP
FTP: File Transfer Protocol
22
TCP, UDP SSH, SCP, SFTP SSH is Secure Shell, used for remote admin SCP is secure copy SFTP is secure file transfer
23
TCP, UDP
Telnet
Unencrypted protocol for remote admin
DO NOT USE. Block this port!
25
TCP
SMTP
Simple Mail Transfer Protocol
common email service
53
TCP, UDP
DNS
Domain Name Service
Resolves hostnames to IPs and IPs to hostnames
69
UDP
TFTP
Trivial FTP. Simplified version of FTP. Not secure.
80
TCP
HTTP
web browsing, not secure
88
TCP, UDP
Kerberos
Network authentication using tickets in Windows domain
110
TCP
POP3
Post Office Protocol v3. Another common email service
119
TCP
NNTP
Network News Transfer Protocol
transports Usenet articles
135
TCP, UDP
RPC/DCOMscm
Remote Procedure Call locates DCOM ports to request a service from a program on another computer on the network
137
137, 138, 139 TCP, UDP
NetBIOS
Used to conduct name querying, sending of data, and other functions
143
TCP
IMAP
Internet Message Access Protocol
another email service, with more features than POP3
161
UDP
SNMP
Simple Network Management Protocol
remotely monitors network devices
162
TCP, UDP
SNMPTRAP
sends Trap and InformRequests to the SNMP Manager on a network
389
TCP, UDP
LDAP
Lightweight Directory Access Protocol
used to maintain directories of users and other objects
443
TCP
HTTPS
Hyper Text Transfer Protocol Secure
secure web browsing. Uses SSL/TLS encrypted connection
445
TCP
SMB
Server Message Block
used to provide shared access to files and other resources on a network
465
TCP
SMTP with SSL/TLS
Secured SMTP email. Also uses port 587
587
TCP
SMTP with SSL/TLS
Secured SMTP email. Also uses port 465
514
UDP
Syslog
used to conduct message logging, esp for router and firewall logs
636
TCP, UDP
LDAP SSL/TLS
Secure version of LDAP. Used to maintain directories of users and other objects
860
TCP
iSCSI
used for linking data storage facilities over IP
989
TCP
FTPS
File Transfer Protocol Secure. Also uses port 990
990
TCP
FTPS
File Transfer Protocol Secure. Also uses port 989
993
TCP
IMAP4 with SSL/TLS
Internet Message Access Protocol over SSL/TLS
email with more features than POP3
995
TCP
POP3 SSL/TLS
Secure version of POP3 email
1433
TCP
MS SQL Server
database
1645
UDP
RADIUS
Remote Authentication Dial-In User Service
Uses 1645 for authentication and 1646 for accounting. Also uses 1812/1813 similarly, with 1812/1813 being the main ports
1812
UDP
RADIUS
Remote Authentication Dial-In User Service
Uses 1812 for authentication and 1813 for accounting. Also uses 1645/1646 similarly, with 1812/1813 being the main ports
1701
UDP
L2TP
Layer 2 Tunnel Protocol
underlying VPN protocol but has no inherent security
1723
TCP, UDP
PPTP
Point to Point Tunneling Protocol
a VPN protocol with built in security
3225
TCP, UDP
FCIP
Fibre Channel IP
Encapsulates Fibre Channel frames within TCP/IP packets
3260
TCP
iSCSI Target
this is a listening port for iSCSI targeted devices when linking data storage facilities over IP
3389
TCP, UDP
RDP
Remote Desktop Protocol
Windows only
3868
TCP
Diameter
More advanced replacement for RADIUS
6514
TCP
Syslog over TLS
Secure version of Syslog for logging of messaging from firewalls, routers, etc.
