Djbdns-Utils
- dnsfilter(1) reverse-resolves IP addresses, converting them to host names.
- dnsip(1) lookup IP addresses
- dnsipq(1) dns lookup tool
- dnsmx(1) prints the MX records of fqdn
- dnsname(1) does a reverse lookup for the IP address
- dnsq(1) sends a non-recursive DNS query to DNS server
- dnsqr(1) asks for records of type
- dnstrace(1) dns lookup tool
- dnstracesort(1) dns lookup tool
- dnstxt(1) prints the TXT record of fqdn
- qualification(5) User's guide to name qualification
- random-ip(1) print random IPv4 addresses