Network

• Subnet Mask Converter — Convert between CIDR notation (/24), decimal mask (255.255.255.0) and binary mask, in either direction.
• VLSM Calculator — Enter the base address, the prefix, and the host count of each subnet — the calculator allocates the space efficiently.
• IP in Subnet Checker — Enter an IP and a subnet (CIDR) to find out whether that IP belongs to that network.
• CIDR Overlap Checker — Enter two CIDRs to find out whether the address ranges overlap.
• IP to Binary and Hexadecimal Converter — Enter an IPv4 address and see each octet (and the full address) in decimal, binary and hexadecimal.
• Data Unit Converter — Convert between bit, byte, and decimal (KB/MB/GB/TB) and binary (KiB/MiB/GiB/TiB) multiples.
• Common Ports Table — Quick reference for the most used network ports — search by number or service name.
• HTTP Status Codes Table — Quick reference for HTTP response codes — search by number or keyword.
• MAC Address Generator and Validator — Validate an existing MAC address or generate a random one for testing.
• Download Time Calculator — Enter the file size and your connection speed to estimate the download time.