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Questions tagged [a-record]

An A record is a type of DNS record that maps a name to an IP address. For example, the A record for serverfault.com is 64.34.119.12

261 questions
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A Record VS. Cname Round N

Experienced DNS Admins please help me understand... I run a small DNS server in a development environment that runs resolution for at most 5 domain names at any one time. My question stems from a discussion here: What's the difference... My…
Patrick R
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Why are Amazon EC2 Elastic IPs encouraged to be used with a CNAME rather than an "A" record?

I am setting up a server on EC2 that will be used by people that will be freaked out when they see ec2-111-111-111-111.compute-1.amazonaws.com in the URL bar. I know this would be solved by using an A record rather than a CNAME, yet Amazon's…
Canuk
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Is a subdomain with both A records and NS records valid?

Let's say I own example.com. I then create an A record on test.example.com to 1.1.1.1. I then create a NS record on test.example.com to ns1.anotherdnshost.com. At another DNS host, I add an A record for the root (test.example.com) to 2.2.2.2. When…
F21
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Is setting an empty/blank DNS A record allowed?

I'm trying to wrap my head around the wonderful world on DNS. I have created a zone file for example.com which contains: @ A 1.2.3.4 * A 1.2.3.4 However I am also setting up my local DNS, local.example.com which I have created a…
John
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Django App Public IP Works but `400 Bad Request Error` when A Record Update

I've got a Django application deployed on an Ubuntu 16.04 EC2 instance using nginx and gunicorn. Unfortunately, after a successful deployment with my public IP, updating my A record with the public IP yielded a 404 Bad Request error at my…
twknab
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Best CNAME TTL strategy for fallover switching

I've recently been thinking about the TTL of our DNS. We have A records for our servers and then CNAME records for the customer facing names. The www.example.com CNAME points to server-01.example.com for example. In the event of a failure we have…
Phil Hannent
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Pingdom error: "No delegation could be found at the parent" when analyzing subdomain

I have a subdomain dramarsarin.crimsonandcyan.com which i wanted to point to another server. I added an A record in the zone file for crimsonandcyan.com with the host 'dramarsarin' and pointed it to the server's ip address. Now when i do a dns check…
Kanishk Dudeja
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CNAME versus an additional A&AAAA record

So, let us say that we have set-up an A record and an AAAA record for @, and for www we have set-up a CNAME pointing to @. When a new visitor visits example.com and the webserver sends a 301 permanent redirect to www.example.com, will that still…
Xen
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should Apex domains (and records) be avoided?

I'm building an app that is hosted on Heroku. Heroku suggests that Apex Domains are a Very Bad Idea -- they suggest using CNAME records and a workaround service like Zerigo or DNSSimple. However, every other host I've used seems to have no issue…
jcollum
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How do large SaaS providers support A records?

According to RFC 1035 CNAME records cannot be used used in a zone apex because a CNAME record cannot exist alongside records such as SOA. This is frequently a source of frustration for those trying to design SaaS applications in order to support…
thexacre
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What has priority: nameservers or a records?

If I have a domain name with nameservers pointing to Webhost One, but have an A Record that points to Webhost Two, which host would the domain name bring me to? I'm pretty sure the A Record takes precedent, doesn't it? I currently have domains with…
bozdoz
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Is @ the same as the IP address for @ in the MX record entry of a zone file?

I have the following configuration in my DNS Zone. I want to switch the @ record to a different IP address, but I want to keep the MX records the same. Please note the IP address has been changed to 76.13.141.185 to protect privacy. So, what I'm…
cwd
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how do you add an A record for a root domain

this seems really simple, but I can't figure it out. I'm using xname.org since it's free and I own a bunch of domains spread over a few different registrars. The setup I desire is very simple: one A record that points the bare domain name to my…
nbv4
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Setting up publicly-accessible DNS name in Google Cloud DNS

I am moving from Microsoft Azure to Google Cloud, and I would like to be able to publicly access one of my virtual machines at myapp.uswest.cloudapp.google.com instead of its external, static IP address. I am hoping someone can let me know if I…
Alexander
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Add A, AAAA, and CNAME record for google app engine project in google cloud platform

I am adding a new google app engine project and trying to map it to a subdomain. I have already created a CNAME which maps newmachine.mycompany.com to newproject.appsport.com, and I am able to use it in 'App Engine' -> 'Settings' ->'Custom…
Anthony Kong
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