When you create a MetaMask account or add a new account to your wallet, you're assigned a unique public address displayed at the top of your homepage. This address is essential for receiving cryptocurrencies and interacting with decentralized applications (dApps).
Ethereum Address Format Explained
Ethereum and Ethereum Virtual Machine (EVM)-compatible networks use a standardized address format:
- Prefix: Starts with
0x - Length: 42 characters total (40 alphanumeric characters following the prefix)
- Case Insensitivity: Addresses can be written in uppercase or lowercase without affecting validity
Why the 0x Prefix?
The 0x prefix indicates a hexadecimal (base-16) number system, commonly used in computer science. Unlike our decimal system (base-10), hexadecimal uses:
- Numerals: 0-9
- Letters: A-F
This 16-character system allows for more efficient data representation in computing.
EVM Network Interoperability
One major advantage of EVM-compatible networks is address uniformity across different blockchains. This means:
- Your MetaMask address works identically on multiple networks
- No need to create separate addresses for different EVM chains
Popular EVM-Compatible Networks
You can use the same MetaMask address on:
- Polygon
- BNB Smart Chain (BSC)
- Fantom
- Avalanche C-Chain
- Arbitrum
- Optimism
👉 Learn how to add these networks to MetaMask
Important Note: While addresses are consistent, always verify network compatibility before transferring assets between chains.
Handling Non-Standard Address Formats
Exercise caution when dealing with:
1. EVM Networks with Unique Formats
Some EVM-compatible networks may use alternative address formats in specific contexts. Always:
- Double-check the address format when switching networks
- Use MetaMask's copy function to prevent errors
2. Non-EVM Networks
Networks like Bitcoin or Solana have fundamentally different architectures:
- Completely distinct address formats
- May require bridges or special wallets for interoperability
- MetaMask Snaps now enable some non-EVM connectivity
Best Practices for Address Safety
- Always verify addresses before sending transactions
- Use copy/paste rather than manual entry
- Start with small test transactions when using new networks
- Bookmark verified addresses for frequent transactions
👉 Discover more wallet security tips
Frequently Asked Questions
Why does my MetaMask address start with 0x?
The 0x prefix identifies it as a hexadecimal Ethereum address, following the standard format for EVM-compatible networks.
Can I use the same address on Polygon and Ethereum?
Yes! Your MetaMask address works identically on all EVM-compatible networks, including Polygon and Ethereum.
What happens if I send tokens to the wrong address format?
Transactions to incompatible addresses may result in permanent loss of funds. Always verify the recipient's address format matches the network you're using.
How can I safely interact with non-EVM networks?
Consider using:
- Official network wallets
- MetaMask Snaps (for supported networks)
- Verified cross-chain bridges
Is my Ethereum address case-sensitive?
No, Ethereum addresses are not case-sensitive. 0xABC... and 0xabc... refer to the same address.
Why do some networks have different address formats?
Different blockchain architectures require distinct addressing systems. EVM networks share formats due to their common technical foundation.