Does CNAME have TTL?

For Windows Active Directory-integrated DNS engines, the default TTL for a CNAME record is one hour. When it is expired, it should resolve the record again from DNS servers that are authoritative to the zone. When it comes to using the CNAME as a failover or disaster recovery tool, a shorter TTL should be used.

What is TTL for CNAME record?

Time To Live
Time To Live (TTL) The TTL is a value in a DNS record that determines the number of seconds before subsequent changes to the record go into effect. Each of your domain’s DNS records, such as an MX record, CNAME record, and so on, has a TTL value.

Can a CNAME point to an A record?

The ‘canonical name’ (CNAME) record is used in lieu of an A record, when a domain or subdomain is an alias of another domain. All CNAME records must point to a domain, never to an IP address.

How do I add a CNAME record to DNS?

Add a CNAME record to your domain’s DNS records

1. Go to your domain’s DNS records.
2. Add a record to your DNS settings, selecting CNAME as the record type.
3. Return to the first window or tab and copy the contents of the Label/Host field.
4. Paste the copied contents into the Label or Host field with your DNS records.

What does the TTL on a CNAME record mean?

At least the CNAME mapping will stay in cache, and only the IP address will be asked twice. In short: putting higher TTL on the CNAME will reduce the size of the responses seen by your clients. It should also help the resolver server. However the number of requests per second should roughly be the same.

What kind of record is a CNAME record?

CNAME record. A Canonical Name record (abbreviated as CNAME record) is a type of resource record in the Domain Name System (DNS) which maps one domain name to another, referred to as the Canonical Name.

How does a CNAME lookup work for a domain name?

Domain Name. This test will list CNAME records for a domain in priority order. The CNAME lookup is done directly against the domain’s authoritative name server, so changes to CNAME Records should show up instantly. Also called a canonical name records, they act as aliases, pointing to another DNS name.

How is a CNAME linked to an IP address?

The records are composed of different types. To link the domain names with an IPv4 address, you need to choose type 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.