This section covers practical tools for network administration and transportation - each built with the same attention to accuracy and ease of use as the rest of the site.
Planning a road trip or wondering how much you spend on gas each year? The fuel cost calculator estimates the exact amount of fuel your trip requires and its total cost, based on your trip distance, vehicle fuel efficiency, and local gas price. It supports miles and kilometers for distance, and mpg, L/100km, km/L, and L/mi for efficiency - making it useful for drivers anywhere in the world.
Network engineers and IT professionals use the IP subnet calculator to quickly determine key network parameters from an IP address and prefix length (CIDR notation). Results include the network address, broadcast address, subnet mask, wildcard mask, first and last usable host addresses, and total host count. It also identifies the IP class (A, B, C, D, or E) automatically.
CIDR (Classless Inter-Domain Routing) notation expresses an IP address and its subnet mask together, such as 192.168.1.0/24. The number after the slash indicates how many bits are used for the network portion, with the remaining bits available for host addresses.
A /24 subnet has 256 total addresses (2^8), but 2 are reserved - one for the network address and one for the broadcast address - leaving 254 usable host addresses.
A subnet mask uses 1s to represent the network bits and 0s for the host bits (e.g., 255.255.255.0). A wildcard mask is the bitwise inverse - 0s for network bits and 1s for host bits (e.g., 0.0.0.255). Wildcard masks are commonly used in access control lists (ACLs) on routers.