Full definition
IPv6 is the next-generation Internet Protocol with a vastly larger address space than IPv4 (340 undecillion addresses vs. 4.3 billion). IPv6 proxies are typically much cheaper — sometimes 1/10th the cost of IPv4 — because there's no scarcity. Some providers (LunaProxy, IPRoyal) offer IPv6 datacenter pools for under $0.10/GB.
The catch: only sites that support IPv6 can be reached over IPv6. Major sites do (Google, Facebook, Cloudflare-fronted properties), but a long tail of older sites are still IPv4-only. If your target supports IPv6 you can save real money; if it doesn't, IPv6 proxies are useless.
Check via `dig AAAA target.com` — if there's an IPv6 address, you can use IPv6 proxies. If not, stay on IPv4.