IPv4
VS
IPv6
IP Protocol
🏆 Winner: IPv6
⚡ Quick Answer

IPv6 has better built-in security (IPsec mandatory). IPv4 requires NAT for security. IPv6 is the future but not fully adopted yet.

Factor IPv4 IPv6
Security ⭐⭐⭐ NAT protection ⭐⭐⭐⭐ IPsec built-in
Support ✅ 100% ⚠️ ~40% of internet
Future Being replaced ✅ The future

IPv4

Legacy internet protocol with 4.3 billion addresses.

✓ Pros

  • Universal support
  • Well understood
  • NAT provides security
  • Works everywhere

✗ Cons

  • Running out of addresses
  • IPsec optional
  • Requires NAT
  • No end-to-end connectivity

IPv6

Modern internet protocol with 340 undecillion addresses.

✓ Pros

  • Unlimited addresses
  • IPsec built-in
  • No NAT needed
  • Better for IoT

✗ Cons

  • Not fully supported
  • More complex
  • Exposes devices directly
  • Can bypass VPN

The Verdict

Both work now. IPv6 is technically better but not universally supported. Most sites use both. Important: disable IPv6 if using VPN - it can leak your real IP.

Frequently Asked Questions

Should I disable IPv6?
Only if using VPN and your VPN doesn't support IPv6. Otherwise, keep it enabled for future compatibility.

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Last updated: April 21, 2026 • Report an error

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