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Technitium DNS Server [18] [19] is a free, opensource [20] (GPLv3), [21] cross platform, authoritative, caching and recursive DNS server software. It supports DNS-over-TLS, DNS-over-HTTPS, and DNS-over-QUIC encrypted DNS protocols. [22] It also supports DNSSEC signing and validation for RSA and ECDSA algorithms with both NSEC and NSEC3.
In Internet computing, NSD (for "name server daemon") is an open-source Domain Name System (DNS) server. It was developed by NLnet Labs of Amsterdam in cooperation with the RIPE NCC, from scratch as an authoritative name server (i.e., not implementing the recursive caching function by design). The intention of this development is to add ...
PowerDNS Authoritative Server (pdns_server) consists of a general purpose authoritative server, and multiple dynamically loadable backends that both run multi-threaded. The core handles all packet processing and DNS intelligence, while one or more backends deliver DNS records using arbitrary storage methods .
Unbound is a validating, recursive, and caching DNS resolver product from NLnet Labs. It is distributed free of charge in open-source form under the BSD license . Features
dnsmasq caches DNS records, reducing the load on upstream nameservers and improving performance, and can be configured to automatically pick up the addresses of its upstream servers. dnsmasq accepts DNS queries and either answers them from a small, local cache or forwards them to a real, recursive DNS server.
Code diversity makes it less likely that a performance or security bug in one DNS server could be exploited to inflict a Denial of Service attack upon an organization. It is for this reason that NSD and Knot DNS are frequently used by root and TLD operators. DNS management software can greatly simplify publishing DNS data to varying DNS servers ...
OpenDNS is an American company providing Domain Name System (DNS) resolution services—with features such as phishing protection, optional content filtering, and DNS lookup in its DNS servers—and a cloud computing security product suite, Umbrella, designed to protect enterprise customers from malware, botnets, phishing, and targeted online attacks.
Deadwood includes built-in "DNS wall" filtering (to protect against external domains which resolve to local IPs), the ability to read and write the cache to a file, DNS-over-TCP support, the ability to optionally reject MX, IPv6 AAAA, and PTR queries, code that stops AR-spoofing attacks, among other features.