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The TCP/IP Guide  9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)       9  TCP/IP Key Applications and Application Protocols            9  TCP/IP Administration and Troubleshooting Utilities and Protocols

TCP/IP Address Resolution Protocol Utility (arp) 1 2 3 4 5 TCP/IP DNS Registry Database Lookup Utility (whois/nicname)

The host Utility

The first alternative to nslookup, host, is most often used for simple queries such as would normally be performed using nslookup’s non-interactive mode. It is invoked in the same way as non-interactive nslookup:

host <host> [<server>]

The output is also similar to that of non-interactive nslookup, but less verbose. An example is shown in Table 292.

Even though host does not operate interactively, it includes a number of options that can allow an administrator to get the same information that would have been obtained using nslookup’s interactive mode. Some of the more common options are shown in Table 293.

Table 293: Typical host Utility Options and Parameters

Option / Parameters	Description
-d	Turn on debug mode.
-l	Provides a complete list of information for a domain; this is similar to the “ls” command in interactive nslookup. This may be used with the “-t” option to select only a particular type of resource record for the domain.
-r	Disable recursion in the request. When this is specified, only the server directly queried will return any information; it will not query other servers.
-t <querytype>	Specifies a query for a particular resource record type, allowing any type of DNS information to be retrieved.
-v	Use verbose mode for output (additional details are provided).
-w	Wait as long as necessary for a response (no timeout).

TCP/IP Address Resolution Protocol Utility (arp) 1 2 3 4 5 TCP/IP DNS Registry Database Lookup Utility (whois/nicname)

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