Networking

Subnets, ports, hardware vendors, transfer sizes, and what a client claims to be.

Physical/Logical

Subnet Calculator IPv4/IPv6 subnet math, splitting, range-to-CIDR, and aggregation.

MAC Address Lookup Identify the hardware vendor from a MAC address.

Port Number Lookup Look up what service a port number is registered to, or search by name.

Open Port Check Test whether a port on your network is reachable from outside.

Transmission

Data Storage Unit Converter Convert between bits, bytes, and transfer rates — decimal and binary. beta runs locally

File Transfer Time Calculator Estimate how long a transfer will take — or the speed you need to hit a deadline. beta runs locally

Other

User Agent Parser Decode a user-agent string into browser, OS, device, and engine — one or many at a time. runs locally