Mapping a Domain Name
I want to map my domain name to my apartment's IP address. It's the first step toward hosting a website 100% at home, relying on my ISP only for the connection itself.
DNS serves as the phone book of the Internet. Let's say I want to visit Mike — I pull out a phone book, look up Mike, and find he lives at 123 Main St. DNS works the same way: I type google.com into my browser, and DNS translates that into Google's actual IP address. It connects a domain name to an IP address.
This post assumes you're on a Debian-based Linux system.
Steps to Follow
- Buy a domain name
- Set up DNS settings
- Map to a web server
- Set up Dynamic DNS
1. Buy a Domain Name
There are several registrars out there. I originally used Google Domains — easy to use and reasonably priced at $12/year per domain.
⚠️ Note: Google Domains was sold to Squarespace in 2023. If you're starting fresh, other solid registrars include Namecheap, Porkbun, or Cloudflare Registrar. This site now lives at mike.helmers.me.
2. Set Up DNS Settings
Once you have your domain, point it at your web server. If you're using a hosted platform like WordPress.com, they'll provide their own nameservers and walk you through the process. For a self-hosted setup, keep the domain on your registrar's default DNS servers and manage the records yourself.
3. Map to a Web Server
Under your registrar's DNS settings, add your home IP address as an A record. Add entries for both yourdomain.com and www.yourdomain.com since visitors might type either.
Key record types to know:
- A Record — Maps your domain to an IPv4 address. This is the primary one.
- CNAME Record — Maps subdomains (like
www) to the primary domain. - TXT Record — Used for verification purposes (e.g., proving domain ownership to a service like Keybase).
4. Set Up Dynamic DNS (Optional for Most People)
One problem with pointing a domain at your home IP is that home IP addresses aren't static — they can change. ISPs are reluctant to give residential customers static IPs, and honestly, home servers are generally frowned upon. To work around this, I'm using Dynamic DNS (DynDNS).
Dynamic DNS software automatically checks your device's current IP address and updates your DNS records whenever it changes.
In your registrar's DNS settings, look for a Dynamic DNS or Synthetic Records section. Enable it for your domain — this will generate a username and password you'll use with DDClient.
Install DDClient:
sudo apt-get install ddclientAnswer the setup questions as best you can — they don't matter much, since we'll overwrite the config. Open the config file:
sudo nano /etc/ddclient.confReplace the contents with:
protocol=dyndns2
use=web
server=domains.google.com
ssl=yes
login=your_generated_username
password=your_generated_password
yourdomain.com
Note: If you're using Squarespace (formerly Google Domains) or another registrar, update the
server=line accordingly. Check your registrar's DDClient documentation.
Save and close, then test it:
sudo ddclient -verbose -foregroundThis will confirm whether DDClient has successfully updated your DNS records with your current external IP.
Takeaways and Future Thoughts
Unexpected problems: Some hiccups setting up Dynamic DNS, but it turned out I had just mistyped a few things.
Future concerns: Nothing significant.
Future enhancements: Nothing at this time — this project does exactly what it needs to do.