12 things about DNS
Did you know….
- There are multiple types of DNS record but the two you probably care about are A and CNAME.
- "A" records point to IP addresses and are required for the domain root to work.
- "CNAME" records point to urls and are required for subdomains to work.
- this.com is a domain. Well technically .com is the domain and this.com is a subdomain of the top level domain (TLD) .com.
- www is a subdomain of the second level domain this.com. But for casual conversation you won’t care. And that is probably fine. But it’s all pretty fascinating. Main thing is, if you’re speaking with network minded people about getting things done, the same words can be used to mean pretty different concepts.
- DNS records are stored in zone files
- Zone files are stored on name servers
- To make a domain resolve to a web server, you need an empty A record pointing to the IP of that server.
- The empty DNS A record is sometime symbolized by an @ sign.
- You can also have wildcard DNS records, symbolized by the asterisk (*)
- A wildcard DNS entry will only catch traffic for subdomains that are not defined later in the DNS zone file. Not for “everything” (the way wildcards typically behave)
- It also helps if you point your domain to the correct name servers.
All that to say, I finally got my domain sorted out so you can get here even if you don’t type in www. I’m only sorry that it took me so long.