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Dynamic DNS (DDNS) Services

The Domain Name System (DNS) provides the mechanism for translating internet domain names into numeric Internet Protocol (IP) addresses. The DNS makes using TCP/IP-based applications much more friendly, by enabling users to specify networkHow a DNS request gets handled locations by name rather than number.

The Internet Corporation For Assigned Names and Numbers or ICANN is responsible for managing and coordinating the DNS to ensure universal redundancy. ICANN is the global, non-profit, private-sector coordinating body acting in the public interest. ICANN ensures that the DNS continues to function effectively by overseeing the distribution of unique domain names. Among its other responsibilities, ICANN oversees the processes and systems that ensure that each domain name maps to the correct IP address.

At the core of the DNS are computers, root servers to be exact. They are coordinated by Internet Corporation of Assigned Names and Numbers. These servers provide resolution for Top Level Domains TLD's. In an Internet address such as, the .com part is known as a Top Level Domain, or TLD. The root servers contain all the Top Level Domain registries, the global registries such as .net, .org, etc. and the location specific registries such as .ca (Canada).

The root servers store Name Server information for a Top Level Domain Name TLD. When an internet address such as is queried, the root servers will return the Authoritative Name Servers IP addresses for In turn, the resolving DNS Server will query the Authoritative Name Server to determine an Internet Protocol/IP address for, and in turn pass this information on to the end user.

Dynamic DNS or DDNS. How it works

Think of the phone system. When you dial a number, it rings at a particular location because there is a central numbering plan that ensures that each telephone number is unique. The DNS works in a similar way. If telephone numbers or domain names were not globally unique, phone calls or e-mail intended for one person might go to someone else with the same number or domain name. Without uniqueness, both systems would be unpredictable and therefore unreliable.

Having a Dynamically assigned IP addresses is alot like having to change your phone number once a day. If other people need to connect to your computer, they would have no way of knowing your current number. Imagine if the phone company changed your number twice a day, people would have a hard time calling you.

Not everyone can have their own static IP address. Their ISP, cable company, or whoever, might let them have a dedicated IP, but they'll probably charge extra for it.

Dynamic DNS comes into play when an internet user either wishes to save the money he or she would spend on a static IP address, or is unable to acquire a static IP address from their ISP. Working much like an old style phone operator, DDNS enables a user to update a DNS server automatically each time their IP changes. So anyone who wants to connect to the user's computer can almost always reach his or her server by entering the user's domain name. The whole process works despite the changing IP addresses. Dynamic DNS allows the end user to run a fully functional internet server, despite changing IP addresses.

Dynamic DNS in laymen's terms


I suspect many of you are already familiar with what a Dynamic DNS Service is and what it does. For those of you who are not, I will do my best to describe in "layman's terms" the service and what it provides internet users world-wide.

I will begin with a simple scenario. Jack, our fictitious computer user, has recently decided to build a web site for his online business activities. Jack has contacted many web hosting providers trying to find the best prices, but finds that to implement his planned web site will require many features that are very costly (far beyond Jacks budget).  Jack contacts his local Broadband provider, thinking that he can host his web site at home and have all the features he could ever want. He is paying for internet anyway right? Jack finds that the Broadband provider also wants a lot of money, even more than the web hosting providers in some cases, for a static IP address, which is crucial to host his web site at home.

At this point you would think Jack is out of options, but he is not. In fact, Jack is about to save hundreds, in some cases. a thousand or more a year by using a Dynamic DNS Service.

Let's peer into the future here a bit and imagine that you are running a Dynamic DNS service and are yourself providing the DDNS that Jack will use. A Dynamic DNS Service offers anyone in the world, regardless of how they connect to the internet, the ability to have a Domain Name, a .com, mapped to their IP address at any given time despite the dynamic nature of most ISP assigned addresses.

Jack has found your website and has quickly realized that you have the answers to all his needs for a fraction of the cost. Jack then downloads and configures your provided client software, and instantly turns his home computer into an internet server.

Some other examples of things you can do with Dynamic DNS service are listed below. Your users will have the ability to have support personnel, employees, etc... access their networks for things such as connecting to a client's computer system through remote access, enabling VPN's between branches, keeping track of branch office print servers, controlling and running mail servers, running web or FTP servers, running online video conferencing software, talking over the internet with voice conferencing, etc...
With our software suite, your future customers will find there is often no need to pay the, sometimes huge, fees associated with running their own internet server. They can conduct business, host a personal website, or just host their own email server. By using your service, your customer's home computer can instantly be an Internet Server. The possibilities are truly unlimited!

Useful Links

List of DNS Server Software
ISC BIND Windows / UNIX GPL BIND (Berkeley Internet Name Server)
POWER DNS UNIX GPL Open Source DNS server covered by the GPL, support is offered on a contract basis.
NSD UNIX GPL An authoritative only, high performance, simple and open source name server.
MaraDNS UNIX GPL MaraDNS was created in response to issues people had with the DNS servers available in early 2001, and boasts extremely effective security
MS-DNS Windows COMMERCIAL Microsoft DNS server which ships with all the Microsoft Server operating systems.
SIMPLE-DNS Windows COMMERCIAL Simple DNS Plus provides an intuitive graphical interface for zone and record management. It automatically checks for and corrects most errors.
MyDNS UNIX GPL MyDNS is a free DNS server for UNIX. It was implemented from scratch and is designed to serve records directly from an SQL database (currently either MySQL or PostgreSQL).


List of Secondary DNS Providers
BuddyNS ALL FREE #1 Recommendation.
These guys only do one thing but they do it very well! This is fastest-to-synchronize secondary DNS service on the Internet!
BACKUPDNS ALL COMMERCIAL Inexpensive secondary DNS hosting
DYNDNS.ORG ALL COMMERCIAL When failure is not an option, you can count on Dynamic Network Services, Inc
XNAME ALL FREE This Free DNS hosting service is provided to help people that don't want to lose time and money with providers not always reactive to DNS changes.
SECURITYSPACE ALL COMMERCIAL Secure, reliable and affordable DNS service.
MICROTECH ALL COMMERCIAL Use our secondary DNS service to instantly increase the reliability and availability of you domain services.
WORLDWIDEDNS ALL COMMERCIAL Bulk Primary DNS services, Secondary DNS services.


List of Dynamic DNS (DDNS) Providers
NO-IP.COM ALL BOTH is one of the top 250 most visited dynamic DNS providers.
ZONEEDIT ALL FREE The industry standard in internet domain name management.
ThatIP ALL COMMERCIAL ThatIP dynamic DNS service gives your computer a friendly name on the Internet, no matter how often your dynamic IP address changes.
SITELUTIONS ALL FREE Sitelutions proudly offers internationally redundant high-quality DNS services for free. ALL BOTH World-class DNS hosting and management services. The best of the best!!
EASYDNS ALL COMMERCIAL Dynamic DNS Hosting, domain name management and registration.
CHANGEIP ALL COMMERCIAL has the Dynamic DNS infrastructure with the flexibility that you need.
DHS ALL FREE DHS International is a provider of services to the Internet community, ranging from domain names to web redirection and other services.
DNSEXIT ALL FREE Provides free DNS Services to business and internet users.
DNSMADEEASY ALL FREE With years of experience, wholesale prices, and 100% up-time history, DNS Made Easy is the #1 choice for companies that need email or DNS services.
DYNU ALL FREE Provides 100% free dynamic DNS service for third level and top level domain names with no restrictions on number of records or domain names.
DYNIP ALL COMMERCIAL One of the very first DNS services ever. Confused about static vs. dynamic IP addresses? Find out how DynIP can help you get more from your Internet connection.
DYNNS ALL BOTH provide a number of free and premium DNS related services for home or office use.
AFRAID.ORG ALL FREE Hosts even work for your LAN! If you have a LAN connected to the internet you can point hosts to private IP addresses (even private IPv6 addresses) and they will work within your network.
MICRO-TECH ALL COMMERCIAL Microtech provides a range of excellent value, reliable DNS services for both home and business use. Credits can be used for dynamic, static, or secondary DNS and you are free to switch between these services at any time.
ULTRADNS ALL COMMERCIAL UltraDNS™ Corporation, the leading provider of Managed DNS Services, creates and powers technology solutions that enhance the reliability, scalability and performance of the world's largest and most highly available networks, including that of Microsoft, Oracle and the .org Top Level Domain root infrastructure.
DDNS.RU ALL FREE Secure Dynamic DNS Services
DNSMAX ALL COMMERCIAL Managed DNS and Dynamic DNS for the Enterprise.
ENOM ALL COMMERCIAL Dynamic DNS Services, ICANN-accredited registrar.

Some additional resources can be found below.
DNS Service Providers at


Web Based Dynamic DNS (DDNS) Server Software
MINTDNS Windows Server COMMERCIAL MintDNS is the most robust and feature rich Dynamic DNS (DDNS) server suite on earth.
GNUDIP UNIX GPL It provides client machines with a static DNS name even if their IP address is dynamically assigned.