do_not_reverse_lookup

        # BasicSocket.do_not_reverse_lookup

(from ruby core)
---
    BasicSocket.do_not_reverse_lookup => true or false

---

Gets the global do_not_reverse_lookup flag.

    BasicSocket.do_not_reverse_lookup  #=> false


(from ruby core)
---
    basicsocket.do_not_reverse_lookup => true or false

---

Gets the do_not_reverse_lookup flag of *basicsocket*.

    require 'socket'

    BasicSocket.do_not_reverse_lookup = false
    TCPSocket.open("www.ruby-lang.org", 80) {|sock|
      p sock.do_not_reverse_lookup      #=> false
    }
    BasicSocket.do_not_reverse_lookup = true
    TCPSocket.open("www.ruby-lang.org", 80) {|sock|
      p sock.do_not_reverse_lookup      #=> true
    }