Filter
Top Products
B-1
TCP and UDP Ports and Services
B
Table B-1 lists common port numbers—well-known ports—assigned to TCP and UDP
services—well-known services—by the Internet Assigned Network Numbers
Authority (IANA). A more complete list is available in RFC 1700, “Assigned Numbers.”
Note – If you are configuring a filter on a PortMaster from the command line interface,
you must use the port number. The PortMaster does not have the /etc/services file and
cannot use NIS to get the equivalent information.
Table B-1
TCP and UDP Port Services
Service Port Protocol Description
ftp-data 20 TCP File Transfer Protocol (FTP) (default data)
ftp 21 TCP FTP (control)
telnet 23 TCP Telnet
smtp 25 TCP Simple Mail Transfer Protocol (SMTP)
(email)
nicname 43 TCP whois Internet directory service
nicname 43 UDP whois Internet directory service
domain 53 TCP Domain Name System (DNS)
domain 53 UDP DNS
tftp 69 UDP Trivial File Transfer Protocol (TFTP)
gopher 70 TCP Gopher
gopher 70 UDP Gopher
finger 79 TCP Finger Protocol
finger 79 UDP Finger Protocol
www-http 80 TCP World Wide Web Hypertext Transfer
Protocol (HTTP)
https 443 TCP HTTP with SSL (secure HTTP)
✍