Can you have too many CNAME records?

While you are allowed to create multiple A and CNAME records for the same destination, you can set only one A and CNAME record per source or host name.

How many CNAMEs can you have?

You can’t have two CNAMEs for the same domain name to different hosts. If you need that have a single name with multiple A records for the actual host(s) and CNAME all your hostnames to that. Then you’ll get the canonical be which will resolve to an IP address from the list at random.

Can you point CNAME to CNAME?

CNAME records can point to other CNAME records, but this is not considered a good practice as it is inefficient. MX and NS records must never point to a CNAME alias. Domains that are used for e-mail may not have a CNAME record – this can have undesirable results with different mail servers.

What happens when a zone contains two CNAME records with the same name?

2 Answers. Multiple CNAME records for the same fully-qualified domain name is a violation of the specs for DNS. Some versions of BIND would allow you to do this (some only if you specified the multiple-cnames yes option) and would round-robin load-balance between then but it’s not technically legal.

Can I have multiple A records?

You can do a lot with A records, including using multiple A records for the same domain in order to provide redundancy and fallbacks. Additionally, multiple names could point to the same address, in which case each would have its own A record pointing to that same IP address. The DNS A record is specified by RFC 1035.

Can there be 2 a records?

Yes you can. It is called round-robin DNS, and the browser just chooses one of them randomly. It is a well used method of getting cheap load balancing, but if one host goes down, users will still try to access it.

How many a records can I have?

People have pointed out that one name/label can have multiple “A” records. The DNS protocol itself using a (signed) 16-bit integer as a count of resource records returned for a query, so for a single query, there’s a limit of 65535 “A” records (less a SOA record for overhead) for a single name.

Can you have multiple A records in DNS?

Should I use CNAME or a record?

General rules: Use an A record if you manage which IP addresses are assigned to a particular machine, or if the IP are fixed (this is the most common case). Use a CNAME record if you want to alias one name to another name, and you don’t need other records (such as MX records for emails) for the same name.

What should my CNAME record be?

A CNAME record must always point to another domain name and never directly to an IP address. A CNAME record cannot co-exist with another record for the same name. It’s not possible to have both a CNAME and TXT record for www.example.com .

What does a CNAME record do?

A Canonical Name or CNAME record is a type of DNS record that maps an alias name to a true or canonical domain name. CNAME records are typically used to map a subdomain such as www or mail to the domain hosting that subdomain’s content.

How many A records can I have?

What are the restrictions on CNAME records?

Restrictions on CNAME Records A CNAME cannot be placed at the root domain level, because the root domain is the DNS Start of Authority (SOA) which must point to an IP address. CNAME records must point to another domain name, never to an IP address.

Can a CNAME record be placed at the root domain level?

A CNAME cannot be placed at the root domain level, because the root domain is the DNS Start of Authority (SOA) which must point to an IP address. CNAME records must point to another domain name, never to an IP address.

What is the difference between CNAME and a record?

With the CNAME type, a domain name is linked with an alias – i.e. another name under which the same offering can be reached. The actual name is the one connected with the IP address in an A record. The advantage here is that should the IP address change, you only have to adjust the A record.

Can a CNAME be used for two different names?

A CNAME makes one record another name for another. If a record could have CNAMES for two names, it wouldn’t be another name for either of them, but a name for something entirely new, making a CNAME entry inappropriate. There’s likely a good way to solve your outer problem though.