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IT Granules - A Record Lookup

What is A Record?

An "A" record, or Address record, is a type of DNS (Domain Name System) record that maps a domain or subdomain to a specific IPv4 address. A records are fundamental components of DNS and play a crucial role in translating human-readable domain names into machine-readable IP addresses, allowing web browsers and other applications to locate resources on the internet.

A Record Lookup

"A record lookup" refers to the process of querying the Domain Name System (DNS) to retrieve the A (Address) records associated with a specific domain or subdomain. A records map domain names to corresponding IPv4 addresses, allowing network resources to be located on the internet.

Purpose:

The primary purpose of A record lookup is to translate human-readable domain names into machine-readable IPv4 addresses. This process is essential for establishing connections to web servers, mail servers, or any other networked devices.

Process:

When a user enters a domain name in a web browser or attempts to connect to a network resource, the device initiates an A record lookup. The DNS resolver queries the authoritative name servers for the domain to obtain the associated IPv4 address.

Structure:

An A record typically includes the domain or subdomain name and the corresponding IPv4 address. For example: example.com. IN A 192.168.1.1

Multiple A Records:

A domain can have multiple A records, each pointing to a different IPv4 address. This is often used for load balancing or redundancy.

Configuration:

A records are configured in the DNS settings of a domain's authoritative name servers. Domain administrators or registrars manage these settings.

Time-to-Live (TTL):

A records, like other DNS records, include a Time-to-Live value, specifying how long the information can be cached by DNS resolvers or other servers.

DNS Resolution:

Once the A record lookup is complete, the DNS resolver caches the result, and subsequent requests for the same domain can be resolved more quickly without querying the authoritative name servers again until the TTL expires.