# 4.3. Options

Search for

  This allows you to specify a particular type of resource record information to be looked up. Supported types are listed below.

Server

  This is the name (or the address) of the domain name server to ask.

## 4.3.1. Resource type

The resource type possible are:

`A` ___ the host's Internet address.

`PTR` _ the host name.

`NS` __ the name server for the named zone.

`MX` __ the mail exchanger.

`CNAME` the canonical name for an alias.

`SOA` _ the domain's ``start-of-authority'' information.

`ANY` _ all informations available.

### 4.3.1.1. Host's authors

This program is originally from Rutgers University. It has been rewritten by Eric Wassenaar, NIKHEF, <e07@nikhef.nl>.

### 4.3.1.2. NsLookup's authors

Andrew Cherenson