Python socket gethostbyname() returns only one IP address

问题

Friends, I'm doing some simple experiments using python socket, where I've a HOSTNAME which resolves with two IP addresses but when I use,

socket.gethostbyname('demo.sample.com')

I'm getting only one IP address. why it's showing that way? is there any other way I can get multiple IP addresses? Please guide me.

Thanks in Advance!

EDIT - 1

I Got it guys, Instead of gethostbyname('demo.sample.com')
I tried gethostbyname_ex('demo.sample.com')
It gives the result as i expected.

Thanks to All

回答1:

From the documentation it is visible that:

• gethostbyname returns only a single IPv4 address. And to cite:
  See gethostbyname_ex() for a more complete interface.
• gethostbyname_ex will return multiple IPv4 address, but check out the usage. And to cite:
  gethostbyname_ex() does not support IPv6 name resolution, and getaddrinfo() should be used instead for IPv4/v6 dual stack support.
• getaddrinfo will return all IPv4 and IPv6 addresses, but check out the usage.

来源：https://stackoverflow.com/questions/43672468/python-socket-gethostbyname-returns-only-one-ip-address