val flags = buf.readShort().toInt() and 0xffff
    require(flags shr 15 != 0) { "not a response" }

    val responseCode = flags and 0xf

    if (responseCode == NXDOMAIN) {
      throw UnknownHostException("$hostname: NXDOMAIN")
    } else if (responseCode == SERVFAIL) {
      throw UnknownHostException("$hostname: SERVFAIL")
    }

    val questionCount = buf.readShort().toInt() and 0xffff

              "74c01b5adb12c100000e10000003840012750000000e10"
          ).decodeHex(),
      )
    }.also { expected ->
      assertThat(expected.message).isEqualTo("sdflkhfsdlkjdf.ee: NXDOMAIN")
    }
  }