Tools for calculating and checking network parameters directly in the browser, with explicit results for each protocol’s boundary cases.
Category
Networking
Calculators and utilities for IP addressing, subnets and network transfers.
Topics
Tools
Guides in this category
- 169.254 IP address: APIPA, link-local, and how to fix itLearn why a device assigns itself a 169.254 IPv4 address, what link-local connectivity permits, and what to check when DHCP fails.
- CIDR vs subnet mask in IPv4Learn how a CIDR prefix converts to an IPv4 subnet mask, what each bit means, and when the two notations are equivalent.
- How many hosts are in an IPv4 subnet?Calculate total and usable IPv4 addresses from a CIDR prefix, including the correct treatment of /31 and /32.
- How to calculate a CIDR prefix from the required host countChoose the smallest IPv4 subnet for a host count and calculate host bits, prefix, mask, and capacity with examples.
- How to calculate an IPv4 subnet step by stepLearn how to obtain network, broadcast and host range from an IPv4 and a CIDR prefix, with a /27 example solved by hand.
- How to convert IPv4 to decimal, binary, and hexadecimalConvert the four octets of an IPv4 address to an unsigned 32-bit integer, hexadecimal, and binary with a verifiable example.
- How to split a /24 network into four /26 subnetsDivide an IPv4 /24 into four /26 blocks and calculate each network, usable host range, and broadcast address in a complete example.
- IPv4 /31 vs /32: differences, hosts, and use casesDistinguish a /31 point-to-point network from a /32 host route and understand the addresses, broadcast, and capacity of each.
- IPv4 network, broadcast, first and last host addressesDistinguish IPv4 subnet boundaries and calculate network, broadcast, and host range with a worked /27 example.
- IPv4 wildcard masks explainedCalculate the inverse of an IPv4 subnet mask, interpret its bits, and avoid treating a wildcard as an IP address.
- Mbps and MB/s: differences and transfer timeDistinguish megabits per second from megabytes per second and learn to estimate how long a transfer takes with correct units.
- Private, CGNAT, and public IPv4 addressesIdentify RFC 1918 addresses and the shared CGNAT range, avoid mixing them up, and check other special-purpose IPv4 blocks.