域名服务器记录nslookup -qt=NS x.com
e?e=x.com

Array
(
    [0] => Array
        (
            [host] => x.com
            [type] => NS
            [target] => c.r10.twtrdns.net
            [class] => IN
            [ttl] => 1
        )

    [1] => Array
        (
            [host] => x.com
            [type] => NS
            [target] => d.u10.twtrdns.net
            [class] => IN
            [ttl] => 1
        )

    [2] => Array
        (
            [host] => x.com
            [type] => NS
            [target] => d.r10.twtrdns.net
            [class] => IN
            [ttl] => 1
        )

    [3] => Array
        (
            [host] => x.com
            [type] => NS
            [target] => c.u10.twtrdns.net
            [class] => IN
            [ttl] => 1
        )

    [4] => Array
        (
            [host] => x.com
            [type] => NS
            [target] => a.u10.twtrdns.net
            [class] => IN
            [ttl] => 1
        )

    [5] => Array
        (
            [host] => x.com
            [type] => NS
            [target] => b.u10.twtrdns.net
            [class] => IN
            [ttl] => 1
        )

    [6] => Array
        (
            [host] => x.com
            [type] => NS
            [target] => a.r10.twtrdns.net
            [class] => IN
            [ttl] => 1
        )

    [7] => Array
        (
            [host] => x.com
            [type] => NS
            [target] => b.r10.twtrdns.net
            [class] => IN
            [ttl] => 1
        )

)