Ethereum Name Service
The DNS of Web3 — turning complex wallet addresses into human-readable .eth names.
Overview
Ethereum Name Service (ENS) is the decentralized naming protocol for the Ethereum ecosystem, translating long hexadecimal wallet addresses (like 0x1234...abcd) into human-readable names (like alice.eth). Founded by Nick Johnson, a former Google engineer, ENS launched in 2017 and has since become one of the most widely adopted pieces of Web3 infrastructure. Just as the Domain Name System (DNS) made the internet accessible by mapping IP addresses to domain names, ENS makes cryptocurrency accessible by mapping blockchain addresses to simple, memorable names.
ENS operates through a system of smart contracts on Ethereum that manage name registration, resolution, and ownership. Users register .eth names through an annual renewal process (paid in ETH), and once registered, a name can point to any cryptocurrency address, IPFS content hash, social media profile, or other metadata. ENS names are themselves NFTs (ERC-721 tokens), meaning they can be transferred, sold on NFT marketplaces, and used as digital identity across the Web3 ecosystem. The protocol supports subdomains (like pay.alice.eth), enabling organizations to create hierarchical naming structures.
In November 2021, ENS airdropped its governance token to early users, creating the ENS DAO — one of the largest and most active decentralized autonomous organizations in crypto. The DAO controls the protocol treasury and makes decisions about pricing, protocol upgrades, and integration partnerships. By 2026, ENS has registered millions of .eth names, integrated with virtually every major wallet and dApp, and expanded beyond Ethereum through Layer 2 resolution and cross-chain name support. ENS has become the de facto identity layer of Web3, with .eth names serving as usernames across DeFi protocols, social platforms, and NFT marketplaces.
ENS solves one of cryptocurrency's biggest usability barriers: the terrifying experience of sending money to a long string of random characters. By providing human-readable names, ENS dramatically reduces errors and makes crypto transactions feel as natural as sending an email. Beyond payments, ENS has evolved into the primary digital identity system for Web3 — a .eth name is effectively a decentralized username that works across thousands of applications. The ENS DAO is one of the most successful examples of decentralized governance, managing a protocol that has become critical infrastructure for the entire Ethereum ecosystem. ENS's integration with traditional DNS through DNSSEC also bridges Web2 and Web3 naming systems.
How It Works
The Basics
ENS uses a system of smart contracts on Ethereum: the Registry (which maps names to owners and resolvers), Resolvers (which translate names to addresses and other records), and Registrar Controllers (which handle the registration and renewal process). To register a .eth name, users commit to a name (a two-step process to prevent front-running), pay an annual fee in ETH (based on name length — 3-character names cost more than longer ones), and receive an ERC-721 NFT representing ownership.
Pros & Cons
- Universally adopted across the Ethereum ecosystem — supported by virtually every wallet, dApp, and exchange
- Names are NFTs (ERC-721) that can be transferred, sold, and traded on open marketplaces
- Active and well-funded DAO with significant treasury and engaged community governance
- Expanding beyond Ethereum with L2 resolution support for cheaper name management
- Bridges Web2 and Web3 through DNSSEC integration, allowing traditional domains to work with ENS
- Annual renewal fees mean names are not truly permanent — forgetting to renew can lead to loss of a valuable name
- Name squatting is rampant — speculators register common names hoping to resell at a premium
- Registration and management on Ethereum mainnet can be expensive during periods of high gas fees
- Governance token distribution was heavily weighted toward early adopters, creating concentration of voting power
- Competition from other naming services (Unstoppable Domains, Solana Name Service) fragments the market
Use Cases
- Replacing long wallet addresses with memorable .eth names for receiving cryptocurrency payments
- Using a .eth name as a decentralized Web3 identity across DeFi, social media, and NFT platforms
- Creating decentralized websites hosted on IPFS accessible through .eth names in compatible browsers
- Organizations issuing subdomains to employees or community members for identity and access management
- Investing in premium .eth names as digital real estate with potential resale value
Technical Details
- Consensus
- N/A (ERC-20 governance)
- Launch Year
- 2017
- Founder
- Nick Johnson
- Max Supply
- 100,000,000
- Blockchain
- Ethereum
- Website
- ens.domains