Java Glossary : DynDNS

Last updated 2004-06-28 by Roedy Green ©1996-2004 Canadian Mind Products

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DynDNS

A domain registration company that offers three free services and two cheap services primarily of interest to people who run web servers on their home machines.

• Free domain names

  that end with the letters:

  ath.cx	dyndns.org	homeip.net	is-a-geek.net	mine.nu
  dnsalias.com	dyndns.tv	homelinux.com	is-a-geek.org	myphotos.cc
  dnsalias.net	dyndns.ws	homelinux.net	isa-geek.com	serveftp.net
  dnsalias.org	gotdns.com	homelinux.org	isa-geek.net	serveftp.org
  dynalias.com	gotdns.org	homeunix.com	isa-geek.org	shacknet.nu
  dynalias.net	homedns.org	homeunix.net	kicks-ass.net
  dyndns.biz	homeftp.net	homeunix.org	kicks-ass.org
  dyndns.info	homeftp.org	is-a-geek.com	merseine.nu

• Dynamic DNS:

  You can have a permanent domain name, even if you host it on your home machine that does not have a stable IP. It is up to you to fill in a form on the DynDNS.org website any time your IP changes. DynDNS notifies the global DNS lookup of the change, and because of the short TTL (Time To Live in cache) of the DNS name, the change effectively propagates though the entire global DNS lookup system in a matter of minutes. Unfortunately, some of the world's DNS servers run Windows, which fails to track updates. They won't notice changes until they are periodically rebooted.

  You can automate the process of detecting that your IP has changed and informing them. There is a HTTP GET protocol for informing DynDNS of IP changes and third party software. that implements it.

  You have to update your IP monthly, even just to keep it the same, or your account will be canceled as inactive.

  To your customers, you look like a perfectly ordinary website. There is nothing special they have to do to access you. The main catch is, you are restricted to using one of DynDNS's free names such as mindprod.dyndns.org for you domain name.

  The disadvantage of doing this is you are advertising your home IP to hackers which makes you more likely to be attacked.

• Webhop

  You can have a permanent domain name of the form above, even if you host your website at an ISP where it has a clumsy name like:
  http://www.oberon.ark.com/~roedy
  Instead, you can have a somewhat shorter name like:
  http://roedy.homelinux.com

• Custom DNS

  is of interest to people who host their own servers at home. It lets you manage the DNS name services, using any domain names you want, not just their 38, with a web based configuration. This means you don't need to become expert in that arcane art of MX records. You can manage subdomains of your domain. This costs $25.00 USD per year.

• Domain Names

  The DynDNS people also sell traditional domain names ending in .bz .cc .cn .com .info .name .net .org .tv .co.uk .org.uk and .us for $15.00 USD per year though .cc .cn and .tv cost extra.

DNS4Me ¤ domain names ¤ domains:DNS2go ¤ IP ¤ List of Dynamic DNS providers

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