Bits, sizes, clocks and permissions.
Number bases and two's complement are on the base converter; the prefix and mask table is on the subnet calculator.
Accepts decimal, 0x hex, 0b binary, 0o octal, and a leading minus as two's complement at the chosen width.
Network speeds are bits per second and decimal (SI): 100 Mbps is 100,000,000 bits a second, which is 12.5 MB/s at best. File sizes in operating systems are often binary (IEC): a GiB is 1,073,741,824 bytes, a GB is 1,000,000,000. Real transfers lose some to protocol overhead; this is the ideal.
A date is read as wall-clock time in the zone above. Numbers of 12 digits or more are taken as milliseconds.