IPv4 vs IPv6
IPv4 addresses are nearly exhausted. IPv6 is the future — but adoption is still uneven. Here's what the difference means practically.
IPv4
32-bit internet protocol addresses — the original internet addressing system, nearly exhausted.
Visit IPv4IPv6
128-bit internet protocol addresses — the successor to IPv4 with virtually unlimited address space.
Visit IPv6Feature Comparison
| Feature | IPv4 | IPv6 |
|---|---|---|
| Address space | ~4.3 billion addresses | 340 undecillion addresses (effectively unlimited) |
| Address format | 192.168.1.1 (4 decimal groups) | 2001:0db8:85a3::8a2e:0370:7334 (8 hex groups) |
| NAT required | Yes (addresses are scarce) | No (every device gets a public address) |
| Global adoption | Still dominant (~60–70% of traffic) | Growing (~30–40% of traffic) |
| Security (IPSec) | Optional | Mandatory (built-in) |
Verdict
IPv4 is still dominant but running out. IPv6 is the long-term future. Most modern networks are dual-stack (both). Check what IP address your current connection uses with our free IP lookup tool.
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Try it freeFrequently Asked Questions
What is the difference between IPv4 and IPv6?
IPv4 addresses are nearly exhausted. IPv6 is the future — but adoption is still uneven. Here's what the difference means practically. On the points that matter most: Address space — IPv4: ~4.3 billion addresses; IPv6: 340 undecillion addresses (effectively unlimited). Address format — IPv4: 192.168.1.1 (4 decimal groups); IPv6: 2001:0db8:85a3::8a2e:0370:7334 (8 hex groups). NAT required — IPv4: Yes (addresses are scarce); IPv6: No (every device gets a public address).
Is IPv4 better than IPv6?
IPv4 is still dominant but running out. IPv6 is the long-term future. Most modern networks are dual-stack (both). Check what IP address your current connection uses with our free IP lookup tool. If you mainly need the core feature without a subscription or signup, Free IP Lookup Tool is a free alternative to both.
Is there a free alternative to both IPv4 and IPv6?
Yes — our Free IP Lookup Tool is completely free with no account required.