Query Internet name servers interactively
The nslookup command is a network administration tool for querying the Domain Name System (DNS) to obtain domain name or IP address mapping or other DNS records.
nslookup has two modes: "interactive" and "non-interactive". In "interactive mode", the user can query name servers for information about various hosts and domains or to print a list of hosts in a domain.
In "non-interactive mode", the user can retrieve specific information for a single host or domain. You can also specify the DNS server to use for the query.
To enter interactive mode, run nslookup without arguments. It will connect to the default DNS server listed in /etc/resolv.conf. Alternatively, you can run nslookup - [nameserver]. For non-interactive mode, simply use nslookup [domain].
nslookup [options] [domain] [dns_server]
-sil: Suppress warning messages.
Domain: Specifies the domain name to query.
If not specified, the default server from /etc/resolv.conf is used. If a DNS server IP is provided, nslookup will query that specific server.
[root@localhost ~]# nslookup www.jsdig.com
Server: 202.96.104.15
Address: 202.96.104.15#53
Non-authoritative answer:
www.jsdig.com canonical name = host.1.jsdig.com.
Name: host.1.jsdig.com
Address: 100.42.212.8
[root@localhost ~]# nslookup www.sustech.edu.cn 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
www.sustech.edu.cn canonical name = www.sustech.edu.cn.w.cdngslb.com.
Name: www.sustech.edu.cn.w.cdngslb.com
Address: 113.96.179.222