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 Help with Host Records

DNS records translate meaningful domain names into IP addresses used to identify
the actual location of devices on the Internet. These host records can be used
to direct your domain name to your web server’s IP address (via A or AAAA
records) or specify which servers handle email delivery for your domain (via MX
records) for example. See below for a full list of supported record types:
   
A (Address) Record

    An A record tells a DNS server what specific IP address to map for a host
name. It is the most common type of DNS record. An A record is typically used to
direct your domain name, for example www.yourname.com, to a web server.

    Example A record format: 98.124.253.253
AAAA (IPv6 Address) Record

    An AAAA (or “quad-A”) record is similar to an A record, except that it maps
a hostname to an IPv6 address. An A record specifies an IPv4 address, which is
currently the dominant Internet Protocol version. In 1998 the IETF designated
IPv6 as the successor to version 4 mainly for its much larger amount of
available addresses, which provides flexibility in allocated addresses and
routing traffic and prevents address exhaustion as more and more hosts are
connecting to the Internet and available IPv4 addresses are running out.

    IPv6 addresses are normally written as eight groups of four hexadecimal
digits, where each group is separated by a colon.

    Example IPv6 format: 2001:0db8:85a3:0000:0000:8a2e:0370:7334

    To shorted the writing and presentation of addresses, several
simplifications to the notation are permitted.

        * Any leading zeros in a group may be omitted; thus, the example
becomes: 2001:db8:85a3:0:0:8a2e:370:7334

        * One or any number of consecutive groups of 0 value may be replaced
with two colons (::): 2001:db8:85a3::8a2e:370:7334


    Optional section

        * This substitution with double-colon may be performed only once in an
address, because multiple occurrences would lead to ambiguity. For example, the
illegal address notation 2001::FFD3::57ab, could represent any of the following:

          2001:0:0:0:0:FFD3:0:57ab

          2001:0:0:0:FFD3:0:0:57ab

          2001:0:0:FFD3:0:0:0:57ab

          2001:0:FFD3:0:0:0:0:57ab
        * Using the double-colon reduction the localhost (loopback) address,
fully written as 0000:0000:0000:0000:0000:0000:0000:0001, may be reduced to ::1
and the undetermined IPv6 address (zero value), i.e., all bits are zero, is
simply ::.

          For example, the addresses below are all valid and equivalent:

          2001:0db8:0000:0000:0000:0000:1428:57ab

          2001:0db8:0000:0000:0000::1428:57ab

          2001:0db8:0:0:0:0:1428:57ab

          2001:0db8:0:0::1428:57ab

          2001:0db8::1428:57ab

          2001:db8::1428:57ab

CNAME (Alias) Record

    A CNAME (or Cononical Name) record tells DNS that this hostname is an alias
of another domain name. This hostname then ends up resolving to the same IP
address as the target domain name.

    This helps if you manage multiple hostnames on the same or even different
domain names that will allways point to the same IP address. If you specify all
of these hostnames as CNAME records that point to one host with an A record,
then if you need to update that IP address the master A record is all that needs
to be updated, and all hostnames referring to it via a CNAME will automatically
resolve to the new address.

    Restrictions

        * A CNAME must have no other records of other types (MX, A, etc). This
is very important especially with the @ record. If you specify a CNAME record
type for the @ hostname, then email will not route properly for this domain
name.
        * CNAME records that point to other CNAME records should be avoided. It
is possible to create infinite loops and other error conditions.
        * Other DNS record types that point to other names, such as NS, MX, PTR,
and SRV should never point to a CNAME.

    Example CNAME record format: www    CNAME    www.myothername.com
URL Redirect record

    URL Redirect is not a native DNS record type. Specifying URL Redirect for a
hostname creates an underlying A record that directs the name to our URL
Forwarding servers. These servers then perform an HTTP 301 redirect to the URL
you specify in the address field. You can specify only the domain name to go to,
or a full path to a specific file.

    Example URL Redirect record formats:

    www    URL Redirect    http://www.someotherdomainname.com/

    blog    URL Redirect    http://weblogs.asp.net/pwilson/

    Note that after redirecting, the target URL will show in the browser’s URL
text box.

    If a user specifies a path or filename after the domain name when requesting
a host that is URL Redirected, that path information is intelligently appended
to the destination URL. In the example above, if a user had entered
“www.myname.com/someotherpage.html” in a browser, this would redirect to
“http://www.someotherdomainname.com/someotherpage.html”.

    Advanced users: The default HTTP code returned for the redirect is 302
("HTTP 302 Found"). To change the code to 301 ("HTTP 301 Moved Permanently"),
add the parameter "redir_code=301" to your redirect address. To change the
example above to use a 301 code instead of the default, you would use:
http://www.someotherdomainname.com/?redir_code=301. If the destination URL
already has querystring parameters, use the ampersand ("&") instead of question
mark ("?").
URL Frame record

    URL Frame is not a native DNS record type. Specifying URL Redirect for a
hostname creates an underlying A record that directs the name to our URL
Forwarding servers. These servers then output an HTML page using a frame to fill
the page. The contents of the destination URL are then loaded into that frame.
The advantage of this over URL Redirect is that the original URL entered by the
user remains displayed in the browser’s URL text box.

    Example URL Frame record formats:

    www    URL Frame    http://www.someotherdomainname.com/

    blog    URL Frame    http://weblogs.asp.net/pwilson/

    Note that after redirecting, the target URL will show in the browser’s URL
text box.

    If a user specifies a path or filename after the domain name when requesting
a host that is URL Redirected, that path information is intelligently appended
to the destination URL. In the example above, if a user had entered
“www.myname.com/someotherpage.html” in a browser, this would redirect to
“http://www.someotherdomainname.com/someotherpage.html”.
TXT Record

    TXT records were originally intended for human-readable text in a DNS
record. This record type is now used as machine-readable data for several
services, such as Opportunistic encryption, Sender Policy Framework (SPF),
DomainKeys Identified Email (DKIM), DNS-SD, etc
 
 
            What is DNS or Name Servers ?
DNS is short for Domain Name Server or Domain Name Service. DNS is an Internet service that translates domain names into IP addresses. Domain names are alphabetic, so they're easy to remember. The Internet however, is  based on IP addresses. Every time you use a domain name a DNS service must translate the name into the corresponding IP address. 
                    Why do you need name servers?
 
Every domain name must have a primary nameserver (eg. ns1.domain-name.com) and at least one secondary nameserver (eg ns2.domain-name.com)  otherwise they won't work! .The second nameserver requirement aims to make the domain name still reachable even if one name server becomes inaccessible. 
What is dynamic  DNS ? 
Dynamic DNS is a system which allows the domain name data held in a name server to be updated in real time. The most common use for this is in allowing a domain name to be assigned to a computer with a varying (dynamic) IP address. This makes it possible for other sites on the Internet to make connections to the machine without needing to track the IP address themselves.
Finding your name servers on your own computer. 
In Linux at a shell prompt type:   cat /etc/resolv.conf
In Windows at a dos prompt type: C:>ipconfig /all 
 Need help with your name servers?  Is your DNS not  working properly?  tekdns.org recommends you visit this site:  intodns.com
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