IPv4 vs IPv6 comparison
IPv4 and IPv6 are the two versions of Internet Protocol used to address and route traffic on the internet. IPv4 uses a 32-bit address space that has run out of new allocations, while IPv6 uses a 128-bit address space designed to support the internet's continued growth.
Download CSV| Feature | IPv4 | IPv6 | Notes |
|---|---|---|---|
| Address size | 32-bit | 128-bit | IPv6 is way bigger |
| Address space | ~4.3 billion | ~3.4×10³⁸ | IPv6 won't run out anytime soon |
| Notation | Decimal dotted | Hexadecimal | IPv6 uses colons instead |
| NAT requirement | Common | Not required | IPv6 gives you direct connections again |
| Security (IPsec) | Optional | Built-in support | Though it depends on actual setup |
| Broadcast | Supported | Not used | IPv6 does multicast instead |
| Multicast | Limited | Native | Works a lot better for scaling |
| Configuration | Manual/DHCP | SLAAC/DHCPv6 | IPv6 can set itself up automatically |
| Performance | Indirect | Indirect | Really comes down to your network setup |
| Adoption | Legacy dominant | Growing | A lot of places use both at once |
| Mobile networks | Partial | Primary | Major carriers are going IPv6-first |
| IoT suitability | Limited | High | Plenty of addresses to go around |
| Backward compatibility | N/A | No | You'll need special transition tools |
Adoption status
- IPv4's address space filled up, so everyone started using NAT and sharing addresses.
- IPv6 adoption is taking off fastest on mobile networks and newer ISPs.
- Most networks today run both IPv4 and IPv6 at the same time.
Limitations and transition challenges
- Here's the problem - IPv6 doesn't work backward with IPv4.
- A lot of older gear and software doesn't support IPv6 yet.
- Getting from IPv4 to IPv6 is complicated and requires extra tools.