The Most Common Used Firewall Ports

Hostman

Sun Feb 28, 2010

1 Comments

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if you are a network administrator, you will find this port helpful. these are the most commonly used ports for firewall and server or computer used today to block ports on your network or system. of course this list does not cover all possible ports
if you are interested in the complete list of all possible ports, please let me know and i can post it

i just posted these because these are the most commonly used ports i use when i need to configure a firewall for example

when i was taking the network + exam, this was also helpful to remember these ports as they are in the test.

port number	TCP/UDP	PROTOCOL	Programs
20 &21	TCP	FTP	ProFTP, WU FTP
22	TCP	SSH	OpenSS, lsh
23	TCP	Telnet	in.telnetd
25	TCP	SMTP	Sendmail, Postfix, Exim, qmail
53	TCP/ UDP	DNS	BIND
67	UDP	DHCP	DHCP
69	UDP	TFTP	in.tftpd
80	TCP	HTTPD	Apache, thttpd
Table Created By Webune.com
88	TCP	Kerberos	MIT, Kerberos, Heimdal
109 & 110	TCP	POP2/POP3	UW IMAP
111	TCP	Portmapper	NFS, NIS
113	TCP	auth/iden	identd
119	TCP	NNTP	INN, Leafnode
123	U	NTP	NTP
137	UDP	NetBIOS Name Service	Samba
138	UDP	NetBIOS Datagram	Samba
139	TCP	NetBIOS Session	Samba
143	TCP	IMAP 2	UW IMAP
177	TCP	XDMCP	XDM, KDM, GDM
220	TCP	IMAP 3	UW IMAP
389	TCP	LDAP	OpenLDAP
443	TCP	HTTPS	Apache
445	TCP	Microsof Ds	Samba
514	UDP	Syslog	syslogd
515	TCP	Spooler	BSD LDP, LPRng, cups-ldp

melvin

Sat Sep 25, 2010

if you are getting ready to take the security plus exam, i would study these ports too well-known tcp ports tcp port number service 20 ftp (data channel) 21 ftp (control channel) 22 ssh 23 telnet 25 smtp 49 tacacs authentication service 80 http (used for the world wide web) 110 pop3 119 nntp 139 netbios session service 143 imap 389 ldap 443 https (used for secure web connections) 53 dns name queries 69 trivial file transfer protocol (tftp) 137 netbios name service 138 netbios datagram service 161 snmp 162 snmp trap commonly used ports port service/protocol 7 echo 11 systat 15 netstat 19 chargen 20 ftp-data 21 ftp 22 ssh 23 telnet 25 smtp 49 tacacs 53 dns 80 http 110 pop3 111 portmap 137, 138, 139 netbios 161/162 snmp 443 https 445 smb 1,812 radius

The Most Common Used Firewall Ports

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