nslookup is part of the bind-utils package. Without bind-utils package installed, you will get the following error when you try to nslookup any domain:
[root@centos6 ~]# nslookup -bash: nslookup: command not found
To install the nslookup in CentOS, simply run this command :
[root@centos6 ~]# yum install bind-utils Loaded plugins: fastestmirror Determining fastest mirrors CentOS6.2-Repository | 1.3 kB 00:00 ... CentOS6.2-Repository/primary | 1.2 MB 00:00 ... CentOS6.2-Repository 3042/3042 Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package bind-utils.i686 32:9.7.3-8.P3.el6 will be installed --> Processing Dependency: bind-libs = 32:9.7.3-8.P3.el6 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Processing Dependency: liblwres.so.60 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Processing Dependency: libisccfg.so.62 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Processing Dependency: libisccc.so.60 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Processing Dependency: libisc.so.62 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Processing Dependency: libdns.so.69 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Processing Dependency: libbind9.so.60 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Running transaction check ---> Package bind-libs.i686 32:9.7.3-8.P3.el6 will be installed --> Finished Dependency Resolution Dependencies Resolved ============================================================================================= Package Arch Version Repository Size ============================================================================================= Installing: bind-utils i686 32:9.7.3-8.P3.el6 CentOS6.2-Repository 177 k Installing for dependencies: bind-libs i686 32:9.7.3-8.P3.el6 CentOS6.2-Repository 849 k Transaction Summary ============================================================================================= Install 2 Package(s) Total download size: 1.0 M Installed size: 2.6 M Is this ok [y/N]: n Exiting on user Command [root@centos6 ~]# nslookup -bash: nslookup: command not found [root@centos6 ~]# yum install bind-utils Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package bind-utils.i686 32:9.7.3-8.P3.el6 will be installed --> Processing Dependency: bind-libs = 32:9.7.3-8.P3.el6 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Processing Dependency: liblwres.so.60 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Processing Dependency: libisccfg.so.62 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Processing Dependency: libisccc.so.60 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Processing Dependency: libisc.so.62 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Processing Dependency: libdns.so.69 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Processing Dependency: libbind9.so.60 for package: 32:bind-utils-9.7.3-8.P3.el6.i686 --> Running transaction check ---> Package bind-libs.i686 32:9.7.3-8.P3.el6 will be installed --> Finished Dependency Resolution Dependencies Resolved ============================================================================================= Package Arch Version Repository Size ============================================================================================= Installing: bind-utils i686 32:9.7.3-8.P3.el6 CentOS6.2-Repository 177 k Installing for dependencies: bind-libs i686 32:9.7.3-8.P3.el6 CentOS6.2-Repository 849 k Transaction Summary ============================================================================================= Install 2 Package(s) Total download size: 1.0 M Installed size: 2.6 M Is this ok [y/N]: y Downloading Packages: --------------------------------------------------------------------------------------------- Total 6.1 MB/s | 1.0 MB 00:00 Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Installing : 32:bind-libs-9.7.3-8.P3.el6.i686 1/2 Installing : 32:bind-utils-9.7.3-8.P3.el6.i686 2/2 Installed: bind-utils.i686 32:9.7.3-8.P3.el6 Dependency Installed: bind-libs.i686 32:9.7.3-8.P3.el6 Complete!
Now you can start use nslookup:
[root@centos6 ~]# nslookup
> www.google.com
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
www.google.com canonical name = www.l.google.com.
Name: www.l.google.com
Address: 209.85.175.105
Name: www.l.google.com
Address: 209.85.175.106
Name: www.l.google.com
Address: 209.85.175.147
Name: www.l.google.com
Address: 209.85.175.99
Name: www.l.google.com
Address: 209.85.175.103
Name: www.l.google.com
Address: 209.85.175.104
> set type=ns
> www.google.com
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
www.google.com canonical name = www.l.google.com.
Authoritative answers can be found from:
l.google.com
origin = ns1.google.com
mail addr = dns-admin.google.com
serial = 1473322
refresh = 900
retry = 900
expire = 1800
minimum = 60
>