The 1-Wire port is based around a DS2482-800 &DS2482-100 I2C to 1-Wire bridge device.

The DS2482-800 provides bi-directional protocol conversion between the I2C port on the Raspberry Pi

and any attached 1-Wire® slave devices. An ESD Protection Diode is used to protect the Board and

Raspberry Pi from electrostatic spikes on the 1-Wire port. Connections to the 1-Wire port can be made through pin on the PCB.

1-Wire 2482-100  1 channel WITH 1 ESD protection diode     DS2482-100 Datasheet

1 Wire  2482-800 8 channel  with 8 ESD protection diode      DS2482-800 Datasheet

with DS18B20 Temperature Sensor                         

18  -- > DS2482-100   1c --> DS2482-800   1f --> DS2482-800   68 --> DS1307 RTC

It appears that OWServer has found 17 1-wire busses,
DS2482-100 is bus.0      

DS2482-800 is bus.1 ..