def get_dhcp_server(network=None, asset=[]):
  """Return IP address of DHCP server based on network or asset.

  Args:
    network: string, white, green or blue
    asset: string, asset name

  Return:
    dhcp_server: string, IP address
  """

  if network == 'blue' or asset[:1] == 'b':
    dhcp_server = '172.16.2.10'
  elif network == 'green' or asset[:1] == 'g':
    dhcp_server = '10.0.2.10'
  elif network == 'white' or asset[:1] == 'w':
    dhcp_server = '194.47.252.134'
  else:
    dhcp_server = None

  return dhcp_server