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 2482-800 8 channel with 8ESD protection diodeDS2482-800Datasheet

with DS18B20Temperature Sensor

1c --> DS2482-800

It appears that OWServer has found 8 1-wire busses,
DS2482-800is bus.0 .. bus 7