Picture this: you’re sending cryptocurrency to a friend, but instead of copying and pasting a jumble of letters and numbers that looks like 0xAbCd...Ef01, you just type yourfriend.eth. It feels almost too simple, doesn’t it? That’s the magic of ENS (Ethereum Name Service) domains. According to the official ENS stats, over 2.8 million .eth names have been registered as of 2025, and yet many people still feel fuzzy on the details. Whether you’re new to crypto or a seasoned user looking for clarity, this article answers the most common questions about ENS domains. Let’s dive in and make sense of it together.
1. What Exactly Is an ENS Domain, and How Does It Work?
An ENS domain is like a nickname for your Ethereum wallet address. Instead of telling someone to send ETH to 0x3A4b...D9F2, you give them yourname.eth. ENS translates that human-readable name into a machine-readable address, similar to how DNS (Domain Name Service) turns google.com into an IP address. But ETH isn’t the whole story—ENS supports over 330 different cryptocurrencies, including Bitcoin, Litecoin, and Dogecoin, within a single .eth name. That’s crucial if you want to simplify receiving payments across multiple blockchains without juggling dozens of addresses.
Under the hood, ENS is built on the Ethereum blockchain, which means it’s decentralized and censorship-resistant. No single company controls your domain. You own it outright when you register, thanks to smart contracts. Think of it less like a website domain and more like a programmable label for your blockchain identity—you can attach your social profile, email, or even an avatar to it.
Quick takeaway: If ENS feels abstract, just compare it to a phonebook. Your .eth name is a memorable entry that points to your long messy number (wallet address). That’s all.
2. Common Questions About Buying and Renewing ENS Domains
👉 “Do I actually own an ENS domain forever? When can I sell it, and can it expire?”
No, you don’t own it forever—ownership works on a yearly subscription model. When you register a .eth name, you pay an annual fee (currently around $5–$20 depending on the length, plus a gas fee). After that period passes, you can let it expire, or you could sell your name on secondary marketplaces like OpenSea. But buyer beware: ENS locks your name’s data for the duration of the registration period. If you accidentally pay only 4 years and try to sell it, the new owner must wait for that period to expire before changing its settings. This design powers another common question:
👉 “Can I use my ENS domain for email?” Some expectations exist here. Technically, yes—you can configure a ENS Telegram record set up properly. Names created for communication records let a domain point to arbitrary text fields. However, unlike traditional email DNS, storing long text (like a real email) may cost too much in gas. A better pattern today is using a link to a secure mailbox or a POAP for contact details. Keep that goal complementary—you connect your ENS to Telegram or Discord as proof for dApps.
👉 “What happens if I forget to renew my ENS domain?” It enters a 90-day grace period after your registration ends. You can still claim it back (pay fee + penalty). After that, another 30 days go external before anyone else can snatch it. Set calendar reminders! People’s hardest miss is auctions from the early days—EN domains didn’t cost yearly before. Might sting badly if .eth names you drop go to renewals.
3. How to Set Up a Subdomain and Keep It Secure
Subdomains are a hidden gem of ENS technology. A subdomain looks like friend.yourname.eth. Anyone can create a subdomain on a parent ENS domain, and it works similarly to DNS subdomains—though there’s control. For expample, registrars must cooperate to assign value to simple projects. Suppose you own yourtld.eth; you could give your business supporter supporter.yourtld.eth. You also assign and revoke owners any time.
Important security notes: You must keep your parent domain’s controller secure. That private key or seed phrase is like master ignition. Services let you grant an ENS delegate wallet for partial permissions instead of exposing ownership. Using an ENS delegate wallet reduces phishing risk since you approve under specific actions (like changing $tokens resolution, without transferring domain rights). Delegate models are thriving via hardware infrastructure. Also isolate proxy wallet carefully—many scams replay attack by linking setText registry after minor authorizations.