nslookup

Use this command to query the DNS server for domain name or IP address mapping or for any other specific DNS record.

Syntax

execute nslookup name <fqdn | ip> type <type> class <class> server <dns_server> port <port_number>

Variable	Description	Default
name <fqdn | ip> type <type> class <class> server <dns_server> port <port_number>	<fqdn | ip>: enter either an IP address or a fully qualified domain name (FQDN) of a host. <type>: optionally specify the DNS query type: A -- host address AAAA -- IPv6 address ANY -- all cached records CNAME -- canonical name DLV -- DNSSEC lookaside validation DNSKEY -- DNS key DS -- delegation signer MX -- mail exchanger NS -- authoritative name server NSEC -- next SECure NSEC3 -- NSEC3 parameters PTR -- domain name pointer RRSIG -- DNSSEC signature SOS -- start of authority zone SPF -- sender policy framework TA -- DNSSEC trust authorities TXT -- text string The default type is A. <class>: optionally specify the DNS class type: either IN or ANY. <dns_server>: optionally specify the DNS server’s host name or IP address. If you do not specify the server here, FortiMail will use its local host DNS settings. <port_number>: optionally specify the port number of the DNS server.	A ANY 53

Example

You could use this command to determine the DNS resolution for the fully qualified domain name mail.example.com

execute nslookup name mail.example.com

The CLI would display the following:

Name: example.com

Address: 192.168.1.15

Similarly, you could use this command to determine the domain name hosted on the IP address 192.168.1.15:

execute nslookup name 192.168.1.15 type ptr

The CLI would display the following:

Address: 192.168.1.15

Name: mail.example.com

You could also use this command to determine the host that is mail exchanger (MX) for the domain example.com:

execute nslookup name example.com type mx

The CLI would display the following:

example.com mail exchanger = 10 mail.example.com.

Related topics

ping

traceroute

system dns