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CONNECTIVITY · 3 MIN READ

IPv4 and IPv6. Two ways to get there.

Both carry internet traffic. They use different address formats, and your device may use both.

IPv4: four familiar numbers

An IPv4 address contains 32 bits, normally written as four numbers from 0 to 255, such as 192.0.2.10. The address space is limited, which is one reason NAT is common.

IPv6: a much larger address space

IPv6 uses 128-bit addresses written in hexadecimal, such as 2001:db8::10. Leading zeros can be omitted, and a single :: can stand for consecutive groups of zeros. IPv6 has no broadcast addresses; multicast handles many equivalent tasks.

Your connection chooses

A dual-stack network supports both protocols. Your browser selects a working route to a service. The IP on this page describes this request; it does not prove that the other protocol is unavailable. A VPN can affect the two protocols differently.

Are IPv6 addresses private?

IPv6 has different address scopes. ::1 is loopback, fe80::/10 is link-local, and fc00::/7 is unique-local. A globally scoped address does not automatically mean a device is reachable: firewall policy still controls inbound traffic.

Reference: RFC 4291 — IPv6 addressing architecture ↗