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ipv6_to_ipv4 

        # Addrinfo.ipv6_to_ipv4

(from ruby core)
---
    ipv6_to_ipv4()

---

Returns IPv4 address of IPv4 mapped/compatible IPv6 address. It returns
nil if `self` is not IPv4 mapped/compatible IPv6 address.

    Addrinfo.ip("::192.0.2.3").ipv6_to_ipv4      #=> #<Addrinfo: 192.0.2.3>
    Addrinfo.ip("::ffff:192.0.2.3").ipv6_to_ipv4 #=> #<Addrinfo: 192.0.2.3>
    Addrinfo.ip("::1").ipv6_to_ipv4              #=> nil
    Addrinfo.ip("192.0.2.3").ipv6_to_ipv4        #=> nil
    Addrinfo.unix("/tmp/sock").ipv6_to_ipv4      #=> nil

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.