IPv6 vs IPv4 VPS - What Operators Need to Know in 2026

IPv4 addresses are a finite resource (4.3 billion total). In 2026, new IPv4 address allocations are exhausted - IANA allocated the last IPv4 blocks to regional registries in 2011. Providers recycle IPv4 addresses, meaning a new VPS may have an IP address previously used by a spammer or abused service. IP reputation is critical for email delivery, access to reputation-sensitive APIs, and avoiding blacklists. Always check your new VPS IPv4 against major blacklists (MXToolbox, Spamhaus) before using it for email or API applications.

IPv6 provides a much larger address space (340 undecillion addresses), making IPv6 addresses more likely to be clean (never previously used or abused). IPv6 also supports privacy extensions (RFC 4941) that generate temporary addresses for outgoing connections, making traffic correlation harder for network observers. For servers, static IPv6 addresses are standard - the privacy extensions apply to client connections, not server addresses.

IPv4 remains necessary for compatibility with infrastructure that has not yet implemented IPv6. Most major websites, APIs, and services support both IPv4 and IPv6 (dual-stack). Some legacy infrastructure, ISPs, and networks are IPv4-only. Running IPv6-only hosting is not yet practical for production applications serving general audiences. Best practice: dual-stack (both IPv4 and IPv6) with IPv6 preferred for outbound connections.

AnubizHost VPS plans include both dedicated IPv4 and IPv6 addressing. You get a dedicated IPv4 (not shared) plus a /64 IPv6 block (2^64 addresses) per server.