MS Azure (IaaS)

Azure DNS Records and limitations

DNS records

 Record names

Azure DNS are specified by using the relative names and fully qualified domain name (FQDN) includes the zone name.

Note:-  Relative record name ‘www’ in the zone ‘’ than the fully qualified record name would be ‘’.

Record types

Every DNS record has a name & type. DNS Records are organized into various types according to the data they contain. Most common type is an ‘A’ record, which maps a name to an IPv4 address & another common type is an ‘MX’ record, which maps a name to a mail server.

Azure DNS supports all common DNS record types: A, AAAA, CNAME, MX, NS, PTR, SOA, SRV, and TXT.

Note that SPF records are represented using TXT records.

Record sets

Record set are where you will have 2 different IP address associated with one domain Name.

If you have an commercial website and your websites require 2 different IP address for failover or reduce the traffic then you can use the record set.

Azure DNS manages all DNS records using record sets. A record set (also known as a resource record set) is the collection of DNS records in a zone that have the same name and the same type.

How to create Record Set:-

  • Select the DNS server
  • Click on Record Set
  • Add the record set



Time to live, or TTL, specifies how long each record is cached by clients before being re-queried. The TTL value is  3600 seconds or 1 hour and we can customized between 1 and 2,147,483,647 seconds.

Wildcard records:

Wild card records are  sent the query with the matching domain name unless there no closer matching name from non-wildcard record set.

Note: We can create the wild card record with ‘*’  ie: ‘*”rcloud’.

A Record:- 

A record maps a domain to the physical IP address of hosting domain. Internet traffic uses the A record to find the computer hosting on your domain’s DNS settings.

The value of an A record is always an IP address, and multiple A records can be configured for one domain name.

A record

AAA Record:- 

A record is to the IPv4 address space, the AAAA record (also known as a quad-A record) is to the IPv6 address space.

AAA Record

CNAME records:

CNAME record called as  Canonical Name record  ) is a type of resource record in the Domain Name System (DNS) used to specify domain name is an alias for another domain canonical domain.

  • Click on Record Set
  • Add the CNAME record
  • Provide the name
  • Type: Cname
  • TTL Value as per your origination
  • TTL unit as per your origination
  • Allias for your CNAME records.

Cname record

MX Record

Mail exchanger record (MX record) is a type of resource record in the Domain Name System that specifies a mail server responsible for accepting email messages on behalf of a recipient’s domain

MX record

NS Records

NS record is a DNS record that lists an authoritative name server for a domain. A domain name can have multiple NS records


Service record (SRV record)

Service record (SRV record) is a specification of data in the Domain Name System defining the location, i.e. the hostname and port number, of servers for specified services.

SRV record

TXT record (short for text record) is a type of resource record in the Domain Name System (DNS) used to provide the ability to associate with some custom name  and unformatted text with a host.

TXT record

PTR Records

The Pointer (PTR) record provides data for reverse DNS, which is used for logging the domain name and verification purposes. Also called inverse DNS.

ptr record


Azure DNS Limits

The following default limits apply when using Azure DNS:

Resource Default limit
Zones per subscription 100  per subscription
Record sets per zone 5000 per subscription
Records per record set 20



3 thoughts on “Azure DNS Records and limitations”

    1. A DNS zone is the contiguous portion of the DNS domain name space over which a DNS server has authority. A zone is a portion of a namespace. It is not a domain. A domain is a branch of the DNS namespace. A DNS zone can contain one or more contiguous domains. A DNS server can be authoritative for multiple DNS zones. A non-contiguous namespace cannot be a DNS zone.
      For More Details: follow: MS technet article.

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