Audit and analyze network allocations with the IPv4 Subnet Mask CIDR Calculator. Calculate network masks, broadcast IPs, usable host boundaries, and CIDR counts for IPv4 ranges. Designed for network administrators, developers, and security analysts, it calculates network blocks, parses IP endpoints, and analyzes host configurations with complete offline safety.
No. This is a local analysis utility. It parses domain FQDN structures, calculates CIDR math, and inspects browser connection boundaries without initiating aggressive, unauthorized port scans or active probes.
Absolutely not. Checkistan does not store or log any IP lookup parameters, subnet ranges, or domain targets. All computations are handled locally inside your browser sandbox.
Yes, all subnet, CIDR, wildcard, and port calculations comply strictly with standard RFC specifications (such as RFC 1878) and IANA port assignments.