IPv4 vs IPv6: What You Need to Know
The internet is transitioning from IPv4 to IPv6. Learn the differences, why it matters for geolocation accuracy, and what it means for your privacy.
The Address Exhaustion Problem
IPv4, the protocol that has powered the internet since 1983, uses 32-bit addresses — giving us approximately 4.3 billion unique addresses. That sounded like plenty in the 1980s, but with smartphones, IoT devices, and a global population increasingly online, we’ve effectively run out.
IPv6 solves this with 128-bit addresses, providing 340 undecillion (3.4 × 10³⁸) unique addresses. That’s enough to assign an IP to every atom on the surface of the Earth — and still have addresses left over.
Key Differences
Address Format
- IPv4:
192.168.1.1— four groups of decimal numbers (0-255) - IPv6:
2001:0db8:85a3:0000:0000:8a2e:0370:7334— eight groups of hexadecimal digits
IPv6 addresses can be shortened by removing leading zeros and collapsing consecutive zero groups with ::. The address above becomes 2001:db8:85a3::8a2e:370:7334.
NAT vs Direct Addressing
With IPv4’s address scarcity, most home networks use NAT (Network Address Translation) — multiple devices share a single public IP address. Your router has one public IPv4 address, and all your devices appear as that same IP to the outside world.
IPv6 has enough addresses that every device can have its own globally unique address. This eliminates NAT but raises new privacy considerations.
Security
IPv6 was designed with IPsec (encryption and authentication) as a mandatory component, though in practice its implementation varies. IPv4 supports IPsec as an optional add-on.
What This Means for IP Geolocation
IPv6 can actually provide more accurate geolocation than IPv4, for several reasons:
- More granular allocation — IPv6 address blocks are often allocated to specific regions or even neighborhoods
- Less NAT interference — Without NAT, the device’s actual connection point is more directly visible
- Newer databases — IPv6 geolocation databases tend to be more current than legacy IPv4 data
However, IPv6 also presents challenges:
- Privacy extensions — Many operating systems randomize the device portion of IPv6 addresses, making tracking harder
- Transition mechanisms — Technologies like 6to4 and Teredo can make geolocation confusing during the transition period
Current Adoption
As of 2025, global IPv6 adoption sits at approximately 40-45%, though it varies dramatically by country:
- India — ~70% (driven by Jio’s mobile network)
- United States — ~50%
- Germany — ~60%
- China — ~30%
- Japan — ~50%
Most major ISPs now support dual-stack (both IPv4 and IPv6 simultaneously), meaning your device likely uses both protocols depending on the destination.
How to Check Your IP Version
When you use our IP Lookup tool, we automatically detect whether you’re connecting via IPv4 or IPv6 and display this prominently. If you see an IPv6 address, your ISP and device support the newer protocol.
You can also check a specific IP address — whether IPv4 or IPv6 — using our lookup page to see its geolocation data.
The Bottom Line
The transition to IPv6 is inevitable and ongoing. For most users, it happens transparently — your ISP and operating system handle the details. But understanding the difference helps you make sense of your IP geolocation data and the privacy implications of your network connection.