> #### Reviewing the list of well-known ports

> Fathom can provide you with a list of well-known ports.

> To review the list of available ports:

> 1. Click Resources from the menu bar.
> 2. Click Discover Network Resources. The Discover Network Resources page appears:

> 3. Click Well-known Ports. The Well-known Ports page appears:

> This page displays a list of predefined ports that are available to be discovered. Each port is identified by the port number, the port type, and an editable default description.

> You can delete any port from the list by selecting the port and clicking Delete. You can also add ports to this list. Type a description in the available field, and then click Add; repeat this step for each port you want to add.

> Besides adding and deleting ports, you can also perform the following actions related to port discovery:

> - Update a port description in the space provided, and click Submit to save the update.
> - Click Discover Network Resources to discover which machines are available.
> - Click Fathom Resource Page to return to that page.

> ##### Naming conventions in port descriptions

> If a port number is one of the registered well-known numbers, a short description of the port appears as the port's name. (Once you create a resource monitor for a port, Fathom displays this descriptive information on the resource monitoring page, under the page title.)

> Table 6–1 identifies names associated with several well-known TCP and UDP port numbers.

> Table 6–1: Well-known ports and their associated names
> Well-known port | Description field acronym
> --- | ---
> TCP Port 21 | FTP
> TCP Port 23 | Telnet
> TCP Port 25 | SMTP
> TCP Port 80 | HTTP
> TCP Port 110 | POP3
> TCP Port 119 | NNTP
> TCP Port 143 | IMAP
> TCP Port 389 | LDAP
> TCP Port 547 | DHCPv6
> UDP Port 53 | DNS
> UDP 161 | SNMP

> If a port is not considered well known, Fathom displays a port name in the Description field that is based on combination of the port number and the protocol type you specify. For example, if you specify the port type as TCP and the port number as 3510, Fathom displays the port name as tcp3510.

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