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Don S, a TZO user
TZO blows me away. It took me all of five minutes to set it up, worked the first time, and it's fast! It's perhaps the best $25 I've ever spent!
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Premier TZO DNS README
Domain Registration and Nameserver Authority
You can use TZO Premier to host your domain name on either a static IP or on a dynamic IP. If you host your domain on a dynamic IP, be aware of what ports your ISP might block so that you can order any additional required TZO services (please see Alternate Ports and Relays).
If you purchased your domain name at a third party Domain Registrar, TZO Premier will work with that existing domain. TZO does not require a 'domain transfer' away from your existing Domain Registrar. To enable TZO Premier to work, at the place you registered the domain you must edit your domain's list of Authoritative Nameservers, removing what was there and in that place you specify the TZO nameservers, You must not mix TZO nameservers with third-party nameservers as this is not supported and will cause problems. TZO permits 'DNS pre-activation' which some country TLDs (such as .de and .ru) require before they will allow you to change nameservers.
TZO Premier is high-end DNS hosting. If you simply want to view a camera or connect to a home computer using dynamic DNS, you probably want our lower cost TZO Standard service (TZO Standard also does not require a domain registration).
Alternate Ports and Relays
Your Internet Service Provider may block certain 'standard' server ports - typically inbound port 80 and inbound + outbound port 25 are blocked. If is a good idea to have someone outside your network who can directly connect to your Internet IP and the service port you are trying to open (or just call the ISP and ask what ports they block - most will tell you).
If your ISP blocks inbound web port 80, you can configure your website or camera to run on an alternate port such as port 81 or port 8000. Because web browsers automatically assume all websites run on port 80, you would have to use a URL with a port number in it such as "http://example.tzo.net:8000/". The TZO Web Relay service will redirect your visitors from your "www." subdomain to this domain+port URL. You still need to open that port in your router's port forwarding, of course.
If your ISP blocks outbound port 25 or if they restrict what domain names you can use on their free email service, you should consider the TZO Outbound Mail Relay service. If your ISP blocks inbound port 25, you should look at Email Hosting, Email Forwarding, or Store and Forward which can accept your domain's email and then hold it or forward it elsewhere as appropriate for that service type.
MX Record Configuration
MX records are automatically generated for all TZO Premier domains. The hostname of the MX record is a "mail." subdomain, plus the rest of your domain (example: mail.example.com). The MX record is "live" as soon as you create the TZO domain so there is nothing for you to configure.
If you plan to send and receive email from your TZO domain, you may want to test (or ask your ISP) to verify if port 25 is unblocked in both the inbound and outbound directions.
The TZO Control Panel will enable you to set a custom MX record, which is needed if your email server is offsite and not at the same location as the rest of your domain.
Reverse DNS requires a static IP address from your ISP. If you require 'matching reverse DNS', you should contact your ISP and specify both the IP addresses and the hostnames those IP address(es) must reverse DNS must resolve "to". How an IP address resolves in DNS is controlled completely by the owner of that IP (your ISP).
If your ISP is unwilling to create reverse DNS records, and/or they are unwilling to 'delegate' the reverse DNS address to TZO, then reverse DNS is not possible. If you needed the reverse DNS for email purposes (due to email recipient domains not accepting email from sites lacking reverse DNS) then you can use our TZO Outbound Mail Relay service to send email.
TZO provides a simple 'offline page', so if your website is going away temporarily (but will be back soon), you can suspend your TZO client and use your TZO Control Panel account options to manually set your domain to point at "offline.tzo.com".
TZO Standard domains feature DNS wildcarding - virtually "any" subdomain plus your domain name will automatically resolve back to the same IP as your domain name. For the host example.com, TZO wildcards subdomains so mail.example.com and mysite-test.example.com automatically resolve to the IP of example.com. DNS wildcarding can be a major convenience feature for DNS management.