URL parser and query editor
Inspect URL components and edit query parameters without losing repeated names, their order or the URL fragment.
IPv4 subnet calculator
Calculate the network, broadcast, usable address range and host count from an IPv4 address with a CIDR prefix or subnet mask.
About this tool
Check address boundaries before planning or reviewing a network. This is a local calculation, not a lookup of geolocation or devices using the addresses.
How to use
Enter an address such as 192.168.1.100/24, or provide the address and a contiguous subnet mask separately. A prefix included in the address takes precedence. Results include the network, wildcard mask, broadcast and usable range.
Prefixes /0–/32 are supported. A /31 uses point-to-point semantics with two addresses; /32 represents one host. Neither lists a broadcast address. This does not look up geolocation or live network settings, and does not support IPv6.
Common questions
Why is there no broadcast address for /31 or /32?
The calculator treats /31 as a point-to-point link with two addresses and /32 as a single host. Ordinary subnets reserve network and broadcast addresses. Counts do not guarantee assignability.
What does 192.168.1.100/24 produce?
The network is 192.168.1.0, broadcast is 192.168.1.255 and ordinary host range is .1–.254: 254 host addresses. The calculator does not check which are already occupied.
Why is the separate mask field disabled?
A prefix written in the address takes precedence. Remove /24 to enter a separate mask such as 255.255.255.0. Masks must have contiguous one bits; 255.0.255.0 is invalid.
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