# host > Lookup Domain Name Server. - Lookup A, AAAA, and MX records of a domain: `host {{domain}}` - Lookup a field (CNAME, TXT,...) of a domain: `host -t {{field}} {{domain}}` - Reverse lookup an IP: `host {{ip_address}}` - Specify an alternate DNS server to query: `host {{domain}} {{8.8.8.8}}`