--- title: "Global DNS concept" slug: "globaldns-info" updated: 2026-09-17T09:18:00Z published: 2026-09-17T09:18:00Z canonical: "guide.ncloud-docs.com/globaldns-info" stale: true --- > ## Documentation Index > Fetch the complete documentation index at: https://guide.ncloud-docs.com/llms.txt > Use this file to discover all available pages before exploring further. # Global DNS concept Available in Classic and VPC A few important concepts about Global DNS are explained prior to learning the overall scenarios of using Global DNS. The following are the main concepts to be explained: - [Domain registration mechanism](/docs/en/globaldns-info#%EB%8F%84%EB%A9%94%EC%9D%B8%EB%93%B1%EB%A1%9D%EB%A9%94%EC%BB%A4%EB%8B%88%EC%A6%98) - [DNS record type](/docs/en/globaldns-info#DNS%EB%A0%88%EC%BD%94%EB%93%9C%ED%83%80%EC%9E%85) Note To aid in understanding of Global DNS concepts, see [glossary](/docs/en/globaldns-glossary). ## Domain registration mechanism If you want to use a domain, purchase and register a domain name to use instead of an IP address, and have a name server containing the mapping information of the domain name and the actual IP address. If you use NAVER Cloud Platform's Global DNS, you can build a name server in a cloud environment but you cannot purchase a new domain name. Therefore, you must first register a new domain name in a certified registration agency such as Gavia, iNames, or Dotname Korea, and then build a name server with Global DNS. ## DNS record type DNS record is a series of characters used to configure settings about a domain in DNS. The following DNS record types are available in Global DNS: ### SOA record - SOA stands for Start of Authority and shows the important information of a domain zone. - In Global DNS, the SOA record is automatically created when adding a domain and cannot be added, edited, or deleted. - Record form: {Domain name server} {Serial} {Refresh} {Retry} {Expire} {TTL} - Serial: version number of the domain zone - Refresh: data renewal interval of the domain zone - Retry: retry interval when the data renewal interval of the domain zone fails to be confirmed - Expire: expiration interval of the domain zone after repeated failure to retry - TTL: application interval of record changes ### A record - It maps a domain name to an IPv4 address. - You can map multiple IP addresses to one domain name, and multiple IPs are answered in round robin order according to the number of requests. - The TTL default is 300 seconds (5 minutes), and setting the TTL too high will delay reflections when changing record values. - Examples - Record name: www.example.com - Record value: 10.0.0.1 ### AAAA record - It maps a domain name to an IPv6 address. - Just like A record, you can map multiple IP addresses to one domain name, and multiple IPs are answered in round robin order according to the number of requests. - The TTL default is 300 seconds (5 minutes), and setting the TTL too high will delay reflections when changing record values. - Examples - Record name: www.example.com - Record value: 2001:0db8:85a3:0000:0000:8a2e:0370:7334 ### NS record - It shows the name server information of a domain. - In Global DNS, the NS record is automatically created when adding a domain, and you cannot add, edit, or delete the record values. - Record values provided: ns1-1.ns-ncloud.com, ns1-2.ns-ncloud.com - The TTL default is 86,400 seconds (1 day) and can be edited. ### PTR record - PTR stands for Pointer and maps an IP address to a domain, as opposed to an A or an AAAA record. - PTR is a record for a reverse domain and is used for purposes such as host/service identification, validation of mail addresses and so on. - The domain name and IP address are written in the other direction and separated by a period (.). - Examples: how to create a PTR record of www.ncloud.com A 49.236.142.51 - Create domain 142.236.49.in-addr.arpa > Add record > Enter record name: 51, select PTR type and enter record value: www.ncloud.com ### CNAME record - CNAME stands for Canonical Name and maps one domain name to a different domain name by defining it as an alias. - CNAME records conflict with all other records, so you cannot add other records if you add one to a host. - You cannot add CNAME records to the root domain. To use this feature in the root domain, use the alias feature provided by Global DNS. - Examples - Record name: www.example.com - Record value: www1.example.com ### MX record - Use to set the mail routing domain for a domain zone for the purpose of using mail services. - Enter the record value as a fully qualified domain name (FQDN). - To enter multiple mail servers, separate them with newlines and add preference values in front of them. Smaller values have higher priority. - Examples - Record name: @.ncloudtest.com - Record value: 10 mx1.ncloudtest.com 20 mx2.ncloudtest.com ### SPF record - SPF stands for Sender Policy Framework, a technology that authenticates email-sending servers. - By setting an SPF record, recipients can check the information in an outgoing email against the SPF record to verify whether the email is forged. - Any email from servers not registered in the SPF record is processed as spam. - Examples - Record name: @.example.com - Record value: v=spf1 include:_spfblocka.ncloudtest.com include:_spfblockb.ncloudtest.com ~ all ### TXT record - A TXT record is a text record consisting of arbitrary strings of characters, and you can enter simple text data about your domain. - It can be used for a variety of purposes including verifying domain ownership, authorizing senders with SPF, adding digital email signatures (DKIM), and preventing spam from being sent. - Examples - Record name: @.example.com - Record value: "favorite drink=orange juice" Note A TXT record supports up to 255 characters; any record longer than this limit is wrapped. ### SRV record - SRV stands for Service, which stores the location (host name and port number) of a service in DNS. - When listing multiple servers, their priority and weight can be indicated. - Servers with higher priorities receive more traffic than other servers. When servers have the same priority value, servers with higher weights receive more traffic than other servers. - Record form: _ {Service}._ {Protocol}.{Domain} SRV {Priority} {Weight} {Port number} {Target} - Examples - Record name: _kerberos._tcp.ncloudtest.com - Record type: SRV - Record value: 10 60 88 kerberos.ncloudtest.com ### CAA record - It specifies a certificate authority (CA) that can issue a certificate for a domain. - A wrong CA may interrupt the issuance of a certificate regarding the domain. - Record form: {flags} {tag} "{value}" - flags: set a value from 0 to 255 - tag: set to the value of issue or issuewild - value: enter a value according to the specified tag value - Examples - Record name: ca.example.com - Record value: 0 issue "ncloud.com" ### DS record - A DS record is a DNSSEC key fingerprint used for zones with delegated security when DNSSEC is enabled and is used to verify the reliability of the subdomain. - In Global DNS, DS records are created automatically when DNSSEC is enabled. - Record form: {Key tag} {Algorithm} {Digest type} {Digest} - Key tag: A numeric value used for record identification - Algorithm: The encryption algorithm used to create a security key for the DNSKEY record (record with a public signing key in the domain zone). It is paired with a hash function, such as RSA/SHA1. - Note that 1 (SHA1) can be a potential threat. - Digest type: the algorithm used to create a digest of DNSKEY records - Digest: the hashed value of the DNSKEY records uniquely identifying the records - Examples - Record name: ds.example.com - Record value: 36061 8 2 b7b5c0f2c4917d6eacc9ba4461e6ae693d7a366823530b385168cc842492c271 36061 8 4 938888f1b4185ed56e65bbc63470d712decc509c1caf1682173134e2d833b8d3676965cc7084d5b1254ca21a62eaf94c