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What Is IPv6?

IPv6 (Internet Protocol version 6) is the successor to IPv4, with 128-bit addresses written as eight groups of hexadecimal digits, such as 2001:db8::8a2e:370:7334. It was designed so the internet would never run out of addresses again.

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how it works

How IPv6 addresses work

An IPv6 address has 128 bits, written as eight groups of four hex digits separated by colons. Leading zeros in a group can be dropped, and one run of all-zero groups can be shortened to ::, so 2001:0db8:0000:0000:0000:0000:0000:0001 becomes 2001:db8::1. The current standard is RFC 8200.

The first 64 bits usually name the network and the last 64 identify the interface. ISPs commonly give each home a /64 or a larger /56 or /48 prefix, which means one household can hold more addresses than the whole IPv4 internet.

  • IPv4

    Address size
    32 bits, about 4.3 billion addresses
    Written as
    203.0.113.45
    Typical home allocation
    One public IP, often shared through NAT
    Website support
    Universal
    Unit sites rate-limit
    The single IP, sometimes the /24

  • IPv6

    This term
    Address size
    128 bits, about 3.4 × 10^38 addresses
    Written as
    2001:db8::45
    Typical home allocation
    A /64 or larger prefix, no NAT needed
    Website support
    Major sites and CDNs; many smaller sites are IPv4 only
    Unit sites rate-limit
    Usually the whole /64 (or larger prefix)
why it matters

Why IPv6 matters for proxy users

Because addresses are nearly free, IPv6 proxies are sold cheaply and in huge numbers. The catch is how websites count them. Since one subscriber can rotate through billions of addresses inside a single /64, anti-abuse systems treat the prefix, not the address, as the user. A thousand IPv6 proxies from one /64 can behave like one IP with a thousand names.

CleanProxies sells IPv4 only: static ISP proxies on US carrier ranges and rotating residential proxies in 190+ countries, which reach every website.

IPv6: what it means for you
  • Check that the target supports IPv6. A site without an AAAA record in DNS cannot be reached over an IPv6-only proxy at all.
  • Ask how many distinct /64 (or /48) prefixes a pool has, not how many addresses.
  • Expect less reputation history per address, which cuts both ways: fewer old flags, but also less earned trust.
  • Use IPv4 for logins and account work, where one stable, well-known address matters.

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Guides from the blog

Setup guides and best practices from the CleanProxies blog.

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Related terms

Terms that come up alongside IPv6.

All glossary terms

IPv6 FAQs

Straight answers about IPv6.

Not inherently. Speed depends on the route and the networks in between. IPv6 can avoid NAT and sometimes takes a shorter path, but in practice the difference is small and varies by network.

Got more questions?All FAQs