nRF24L01+ HOW TO GET THE SENDER PIPE ADDRESS..????

I m trying to get the pipe address of sender node.. my code is like this..

uint8_t pipeNum;
if (radio.available(&pipeNum))
{
Serial.print("new msg recvd from: ");
Serial.println((long)pipeNum, HEX);
char text1[32] = {0};
float x;
radio.read(&text1, sizeof(text1));
Serial.print(text1);
Serial.println();

}