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  • http://www.icann.org/
    • https://en.wikipedia.org/wiki/ICANN - a nonprofit organization that is responsible for coordinating the maintenance and procedures of several databases related to the namespaces of the Internet - thereby ensuring the network's stable and secure operation.[1] ICANN performs the actual technical maintenance work of the central Internet address pools and DNS Root registries pursuant to the Internet Assigned Numbers Authority (IANA) function contract.


  • http://en.wikipedia.org/wiki/DNS_zone - any distinct, contiguous portion of the domain name space in the Domain Name System (DNS) for which administrative responsibility has been delegated to a single manager. A DNS zone is implemented in the configuration system of a domain name server. Historically, it is defined in the zone file, an operating system text file that starts with the special DNS record type Start of Authority (SOA) and contains all records for the resources described within the zone. This format was originally used by the Berkeley Internet Name Domain Server (BIND) software package, and is defined in RFC 1034 and RFC 1035.

The domain name space of the Internet is organized into a hierarchical layout of subdomains below the DNS root domain. The individual domains of this tree may serve as delegation points for administrative authority and management. However, usually it is furthermore desirable to implement fine-grained boundaries of delegation, so that multiple sub-levels of a domain may be managed independently. Therefore, the domain name space is partitioned into areas (zones) for this purpose. A zone starts at a domain and extends downward in the tree to the leaf nodes or to the top-level of subdomains where other zones start.

From DreamHost wiki;

Forward mapping of hostname to an IP address (
Forward mapping of hostname to an IPv6 address.
Reverse mapping of an IP address ( to a hostname (dreamhost.com).
Mail eXchange records tell you which hostname to connect to for sending email.
Say it, See Name, it points one domain name to another domain name, including mail service.
Text records, these are free form text strings, used for things like SPF.
Service records advertise a specific service a server offers. Zeroconf and XMPP Federation (Jabber and Google Apps) use SRV records in addition to PTR records.
Delegates a domain or subdomain to another DNS server.
  • xip.io - wildcard DNS for everyone. xip.io is a magic domain name that provides wildcard DNS for any IP address. Say your LAN IP address is Using xip.io, [maybesomething.] resolves to No configuration required! A free service from Basecamp.

  • https://en.wikipedia.org/wiki/Name_server - a computer hardware or software server that implements a network service for providing responses to queries against a directory service. It translates an often humanly-meaningful, text-based identifier to a system-internal, often numeric identification or addressing component. This service is performed by the server in response to a service protocol request. An example of a name server is the server component of the Domain Name System (DNS), one of the two principal namespaces of the Internet. The most important function of DNS servers is the translation (resolution) of human-memorable domain names and hostnames into the corresponding numeric Internet Protocol (IP) addresses, the second principal name space of the Internet which is used to identify and locate computer systems and resources on the Internet.

Root zone

  • https://en.wikipedia.org/wiki/Root_name_server - a name server for the root zone of the Domain Name System (DNS) of the Internet. It directly answers requests for records in the root zone and answers other requests by returning a list of the authoritative name servers for the appropriate top-level domain (TLD). The root name servers are a critical part of the Internet infrastructure because they are the first step in translating (resolving) human readable host names into IP addresses that are used in communication between Internet hosts.

A combination of limits in the DNS and certain protocols, namely the practical size of unfragmented User Datagram Protocol (UDP) packets, resulted in a decision to limit the number of root servers to thirteen server addresses. The use of anycast addressing permits the actual number of root server instances to be much larger, and is 504 as of 17 January 2016.



Good words(?)

to avoid

Do NOT use GoDaddy. Google it +




acronym in url, not domain - seo?






# Google DNS

See also #DNSCrypt




  • systemd-resolved is a system service that provides network name resolution to local applications. It implements a caching and validating DNS/DNSSEC stub resolver, as well as an LLMNR resolver and responder. In addition it maintains the /run/systemd/resolve/resolv.conf file for compatibility with traditional Linux programs. This file may be symlinked from /etc/resolv.conf.
  • systemd-resolve — Resolve domain names, IPV4 and IPv6 addresses, DNS resource records, and services


  • https://github.com/kvz/nsfailover - Every minute (or whatever), nsfailover.sh checks to see if the primary configured nameserver can resolve google.com. If it cannot, it writes the secondary, or even tertary server to function as the primary server in /etc/resolv.conf

Servers, proxy, cache



  • http://www.yadifa.eu/ YADIFA® is designed specifically for the efficient management of large Internet zones and uses dynamic updates to instantly change domain name records. It is equally optimised to handle multiple Internet zones. Our benchmark tests show how we measure up to the competition.

Knot DNS



  • Unbound is a validating, recursive, and caching DNS resolver.


  • Dnsmasq provides network infrastructure for small networks: DNS, DHCP, router advertisement and network boot. It is designed to be lightweight and have a small footprint, suitable for resource constrained routers and firewalls. It has also been widely used for tethering on smartphones and portable hotspots, and to support virtual networking in virtualisation frameworks. Supported platforms include Linux (with glibc and uclibc), Android, *BSD, and Mac OS X. Dnsmasq is included in most Linux distributions and the ports systems of FreeBSD, OpenBSD and NetBSD. Dnsmasq provides full IPv6 support.



  • nscd - name service cache daemon


whois domain.name
  • DNSYO is a little tool I built to help me keep track of DNS propagation. In short, it's nslookup, if nslookup queried over 1500 servers and collated their results.


dig any domain.name
  show all records for domain



  • iodine lets you tunnel IPv4 data through a DNS server. This can be usable in different situations where internet access is firewalled, but DNS queries are allowed. It runs on Linux, Mac OS X, FreeBSD, NetBSD, OpenBSD and Windows and needs a TUN/TAP device. The bandwidth is asymmetrical with limited upstream and up to 1 Mbit/s downstream. [10]



  • https://en.wikipedia.org/wiki/TSIG - Transaction SIGnature, protocol defined in RFC 2845. It is used primarily by the Domain Name System (DNS) to provide a means of authenticating updates to a DNS database. It is most commonly used to update Dynamic DNS or a secondary/slave DNS server. TSIG uses shared secret keys and one-way hashing to provide a cryptographically secure means of authenticating each endpoint of a connection as being allowed to make or respond to a DNS update.



still CAs, registrars and TLDs




sudo dnscrypt-proxy -R dnscrypt.eu-dk --local-address=

Using dnsmasq listening on port 40 to cache requests. Also, edit dnsmasq.service to load after After=dnscrypt-proxy.service.


systemctl edit dnscrypt-proxy.socket

Note: The ListenStream and ListenDatagram options need to be cleared with empty assignment before overriding, otherwise the new address would be added to the list of sockets.




  • DNSCrypt.eu does not censor or change DNS lookups, nor log your traffic through the DNSCrypt service in a way that can identify you.
    • and










  • FreeDNS - Free subdomain AND domain hosting!


GNU Name System