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Basic Guide to DNS

 
This is a list of common terms that you'll encounter when managing a domain or using our spam and virus protection service using spamjadoo. Click a term below to jump to the description of the term, and its practical use with our protection from spam and viruses for Your Domain.

Since registrars, hosts, and record configurations vary, this is a basic guide to DNS.
 
DNS Domain Name
Domain Registrar Top Level Domain
Second-level Domain Third-level Domain
Domain Host A Record
NS Record MX Record
CNAME Record IP Address
Custom URLs WHOIS directory
 
DNS
DNS stands for Domain Name System. This system is in place to organize and identify domains. Essentially, DNS provides a name for a domain's one or more IP addresses. For instance, the domain name ajay.example.com might translate to 198.102.434.8. This makes it much easier to remember URLs and email addresses.

DNS is also used to find out where to deliver email for a particular address. This is done with MX Records.

You need to have a registered domain name to use our spam and virus protection services.
  Domain Name
Domain names are easy-to-remember names (URLs and email addresses) that are associated with one or more IP addresses. Since a web page is defined by its URL, the page can move to a different IP address without affecting visitors.

Example: www.datainfosys.com

The whole domain name can not exceed a total length of 255 characters, but some registries have shorter limits.

   
  Domain Registrar
Domain registrars sell Internet domain names (ex. Netsol.com or registerit.in ).
If your domain registrar is separate from your domain host, you'll need to add the host's name servers to your registrar's account. For example, if you purchase a domain name from namecheap.com (which offers domain registration) and host your domain with DynDNS (which offers domain hosting), you'll add the name servers of DynDNS (ns1.mydyndns.org and ns2.mydyndns.org) to your account with namecheap.com.
 
We offers domain registration with a select group of domain registration partners. This allows you to purchase a domain name and sign up for our services at the same time. If you purchase a domain name while signing up, we will auto-configure services for your domain so that you won't need to manually configure MX and CNAME records.

If you purchased your domain name before signing up for our services, than you have to follow instructions for modifying MX records.
   
  Top Level Domain
Top-level domains are the last part of a domain name - the letters after the last period. Some examples are: biz com org edu us ca fr de travel local es pl in
   
  Second-level Domain
Second-level domains are directly below top-level domains. Some current examples are:
 
Second-level Domain Domain Name
Spamjadoo spamjadoo.com
Wikipedia wikipedia.org
Ontariotravel ontariotravel.com
Craigslist craiglist.com
Xgen xgen.in
   
 
Third-level Domain

Third-level domains are also known as subdomains and CNAMEs. In a URL, the subdomain is written before the domain name. Here's some examples:
 
Subdomain URL
affiliates http://affiliates.art.com
www http://www.rockfound.org
men http://men.style.com
mail http://mail.datainfocom.in
bus http://www.bus.umich.edu
 
To set up web publishing with Spamjadoo for Your Domain, you'll need to pick a subdomain as your web publishing address.
   
  Domain Host
Domain hosts run DNS servers for your domain. This includes A records, MX records, and CNAME records. Most domain hosts offer domain name registration as well.
   
  A Record
A records (also known as host records) are the central records of DNS. These records link a domain, or subdomain, to an IP address.

A records and IP addresses do not necessarily match on a one-to-one basis. Many A records correspond to a single IP address, where one machine can serve many web sites. Alternatively, a single A record may correspond to many IP addresses. This can facilitate fault tolerance and load distribution, and allows a site to move its physical location.

Spamjadoo for Your Domain does not support IP addresses alone. Instead of using A records, you can set up email and web publishing by modifying your MX and CNAME records with your domain host.
   
  NS Record
Name server records determine which servers will communicate DNS information for a domain. Two NS records must be defined for each domain. Generally, you will have a primary and a secondary name server record - NS records are updated with your domain registrar and will take 24-72 hours to take effect.

If your domain registrar is separate from your domain host, your host will provide two name servers that you can use to update your NS records with your registrar.
If you're not sure who is hosting your domain, you can perform a free NS Lookup. Here's how:
 
1. Visit Google.com.
2. Search for NS lookup.
3. Select a search result.
4. Type your domain name into the tool.
5. Select NS records or Any records for your query.
6. Click Look it up.
  Example result (showing that dilDNS is the domain host for datainfosys.com):

datainfosys.com nameserver = ns4.dildns.com.
datainfosys.com nameserver = ns1.dildns.com.
datainfosys.com nameserver = ns2.dildns.com.
datainfosys.com nameserver = ns3.dildns.com.
   
  MX Record
Mail Exchange records direct email to servers for a domain, and are listed in order of priority. If mail can't be delivered using the first priority record, the second priority record is used, and so on.

To set up email with us for Your Domain, you need to configure the MX records with your domain host using our server information.
If you'd like to check the status of your MX records, you can perform a free MX lookup. Here's how:
 
1. Visit Google.com.
2. Search for MX lookup.
3. Select a search result from the list.
4. Type your domain name in to the field.
5. Select MX records if it's not the default search query.
6. Click Lookup.
 
  Example result
(showing that email for datainfosys.net is directed to aspmx.spamjadoo.com):
datainfosys.net mail is handled by 1 ASPMX.SPAMJADOO.COM.
datainfosys.net mail is handled by 5 ASPMX.SPAMJADOO.COM.

The first entry has a priority value of 1, and the second entry has a priority value of 5.
   
  CNAME Record
Canonical name records are aliases for A records. For each CNAME record, you can choose an alias and a host.
If you'd like to check the status of your CNAME record for web publishing, you can perform a free CNAME lookup. Here's how:
 
  1. Visit Google.com.
2. Search for CNAME lookup.
3. Select a search result from the list.
4. Type your web publishing address in to the field.
5. Select CNAME record if it's not the default search query.
6. Click Submit, or Lookup.  
   
  IP Address
Internet Protocol addresses are unique numbers that allow devices to locate information on a network.

Since a domain name may have one or more associated IP addresses, Our protection servers with spamjadoo and xgen hosting for Your Domain doesn't support email configuration using IP addresses alone.
   
  Custom URLs
Custom URLs, or short URLs, make using the Internet easier. A custom URL allows you and your users to access the login page for services at your domain with a simple, easy-to-remember address. With hosted protection and email for Your Domain, your custom URLs may follow this format:

http://[customize this section].your_domain.com  
   
  WHOIS directory
The WHOIS directory is a public listing of domain names, and people or organizations associated with each domain name.
As a privacy measure, some domain name owners prefer to have their personal information hidden from the WHOIS directory. This is similar to the way someone may want his/her personal telephone number unlisted in a local telephone book.

The WHOIS directory is used to determine the owner of domain names and IP addresses. There are many free web-based directories available on the Internet. The information provided in the WHOIS directory includes a mailing address and a telephone number.
 
  Example:
Published
Domain Name: DATACERAMICS.COM
Registrant:
 

Registrant

DATA INFOSYS LIMITED
INSIDE JAIPUR GLASS TONK ROAD
JAIPUR, RAJASTHAN 302018 INDIA
 
Private

Domain Name: THEURBANEXPERIENCE.ORG
Registrant:
WhoisGuard Protected
   
   
 

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