The following were taken from various HTML pages under http://cr.yp.to/djbdns.html
dnscache is a local DNS cache. It accepts recursive DNS queries from local clients such as web browsers and mail transfer agents. It collects responses from remote DNS servers. It caches the responses to save time later.
tinydns is a DNS server. It accepts iterative DNS queries from hosts taround he Internet, and responds with locally configured information.
pickdns is a load-balancing DNS server. It accepts iterative DNS queries from hosts around the Internet, and responds with a dynamic selection of locally configured IP addresses with 5-second TTLs.
walldns is a reverse DNS wall. It accepts iterative DNS queries for in-addr.arpa domains from hosts around the Internet, and supplies generic responses that avoid revealing local host information.
rbldns is an IP-address-listing DNS server. It accepts iterative DNS queries from hosts around the Internet asking about various IP addresses. It provides responses showing whether the addresses are on a locally configured list, such as RBL or DUL.
axfrdns is a DNS zone-transfer server. It reads a zone-transfer request in DNS-over-TCP format from its standard input, and responds with locally configured information.
The security of this software is guaranteed by the author. Details of the guarantee can be found at http://cr.yp.to/djbdns/guarantee.html
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