Package: ldns

"ldns" package binaries on CentOS:

/usr/bin/drill /usr/bin/ldns-chaos /usr/bin/ldns-compare-zones /usr/bin/ldns-dane /usr/bin/ldnsd /usr/bin/ldns-dpa /usr/bin/ldns-gen-zone /usr/bin/ldns-key2ds /usr/bin/ldns-keyfetcher /usr/bin/ldns-keygen /usr/bin/ldns-mx /usr/bin/ldns-notify /usr/bin/ldns-nsec3-hash /usr/bin/ldns-read-zone /usr/bin/ldns-resolver /usr/bin/ldns-revoke /usr/bin/ldns-rrsig /usr/bin/ldns-signzone /usr/bin/ldns-test-edns /usr/bin/ldns-testns /usr/bin/ldns-update /usr/bin/ldns-verify-zone /usr/bin/ldns-version /usr/bin/ldns-walk /usr/bin/ldns-zcat /usr/bin/ldns-zsplit

You may install this package on CentOS with yum install ldns