I need the rules for these ip address shorthands.

C:\Users\avina>ping 1.1

Pinging 1.0.0.1 with 32 bytes of data: Reply from 1.0.0.1: bytes=32 time=3ms TTL=58 Reply from 1.0.0.1: bytes=32 time=4ms TTL=58 Reply from 1.0.0.1: bytes=32 time=4ms TTL=58 Reply from 1.0.0.1: bytes=32 time=5ms TTL=58

Ping statistics for 1.0.0.1: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 3ms, Maximum = 5ms, Average = 4ms