Record type of domain name resolution

A record, CNAME, MX record, NS record, TTL meaning 

1, A record: also known as IP point, the user can set the sub-domain name here and point to his own target host address, so as to achieve the server through the domain name.   

Description: The point of the target host address type can only use IP addresses;   

1) A record add   

names to fill the subdomain in the "Host Name", "type" is A, "IP address / hostname" fill in web server IP address, click the "Add" button. 

  Note: If the "Hostname" column is empty, it means pointing to the domain name arebz.com itself.  

2) To modify the A record, just change the original IP address directly to the new IP address in the “IP Address/Host Name” column, and then click the “Modify” button. 

3) Delete the A record Click the corresponding “Delete” button after the A record to be deleted.   

4) The pan-domain name resolution will point all unspecified sub-domain names of the domain to a space.  

 Fill in the "Host Name" with *, "Type" is A, "IP Address/Host Name" is filled in with the IP address of the web server, and click the "Add" button. 

5) Implementation of load balancing: Server Load Balancing (SLB) refers to dynamically distributing network load over a series of resources. 

Load balancing reduces network congestion, improves overall network performance, improves self-healing, and ensures the availability of critical enterprise applications. 

When the same subdomain has multiple destination addresses, it means round robin, which can achieve load balancing, but requires virtual host service provider support. 



2, CNAME: usually called the alias point. You can set an alias for a host.

For example, if you set test.arebz.com to point to a host www.arebz.com, you can use test.arebz.com instead of visiting www.arebz.com.  

Note: The destination host address of the CNAME can only use the host name, and cannot use the IP address; the  

host name cannot have any other prefix before it, such as: http:// is not allowed; 

A record takes precedence over the CNAME record. That is, if a host record has both an A record and a CNAME record, the CNAME record does not take effect. 

1) Add a CNAME record. Fill in the name of the subdomain in the "hostname", "type" is CNAME, fill in the destination address in "IP address/hostname", and click the "Add" button. 

2) To modify the CNAME record, just change the original destination address directly to the new address in the "IP address/hostname" column, and then click the "Modify" button.   

3) Delete the CNAME record Click the corresponding "Delete" button after the CNAME record you want to delete. 



3, MX records: mail exchange records. 

Used to point the email ending with the domain name to the corresponding mail server for processing. 

For example, if the user's mail is terminated by the domain name arebz.com, you need to add the MX record of the domain name in the management interface to process all emails ending with @arebz.com. 

Note: MX records can use host name or IP address;  

 MX records can be set by priority and primary and secondary server settings. The smaller the number in "priority", the higher the level. 

You can also use the same priority to achieve load balancing;   

if you fill in the subdomain name in the Host Name, the MX record will only take effect for that subdomain. 

1) Add the MX record "Hostname" column is empty, "Type" is MX, "IP address / hostname" is filled in the destination address or IP,

Fill in the number in the "Priority" (must be an integer), click the "Add" button.   

2) To modify the MX record, simply change the original destination address or IP directly to the new address or IP in the “IP Address/Hostname” column, and then click the “Modify” button.   

3) Delete the MX record Click the corresponding “Delete” button after the MX record to be deleted.   

4) Load Balancing Server (SLB) refers to intelligently distributing network load on a series of resources. 

Load balancing reduces network congestion, improves overall network performance, improves self-healing, and ensures the availability of critical enterprise applications.   

When the MX record of the domain name has multiple destination addresses and the priorities are the same, it means that the round robin can achieve the purpose of load balancing, but it needs the support of the mailbox service provider. 

4, NS record resolution server records. Used to indicate which server is parsing the domain name. The NS record here only takes effect on the subdomain. 

For example, if the user wants to resolve news.arebz.com by 12.43.56.78, you need to set the NS record of news.arebz.com.   

Note: The smaller the number in "Priority", the higher the level; the "IP address/hostname" can be filled in with either an IP address 

or a host address like ns.arebz.com, but the host address must be guaranteed. effective. For example, 

point the NS record of news.arebz.com to ns.arebz.com, and also set the ns.arebz.com pointer when setting the NS record. 

Otherwise, the NS record will not be parsed normally; the NS record takes precedence over the A record. . That is, if a host address has both an NS record and an A record, the A record does not take effect. 

The NS record here only takes effect on the subdomain.   

1) Add the NS record and fill in the name of the subdomain in the "hostname", "type" is NS, "IP address/hostname" 

is filled in the IP address or name of the resolution server (such as ns.arebz.com), Click the "Add" button.   

2) To modify the NS record, simply change the original server destination address or IP directly to the new address or IP in the “IP address/hostname” column, and then click the “Modify” button.   

3) Delete the NS record and click the corresponding “Delete” button next to the NS record to be deleted. 



5, TTL value The full name of the TTL value is "Time To Live", which simply means that the DNS record is cached on the DNS server. LONDON King DNS server default 

recognized with immediate effect, customers generally do not modify the increase over 15 minutes can be used.

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