Utility bench / Free browser tools

Networking help tools.

Fast utilities for subnetting, DNS, email security, NAS capacity, backup sizing, and transfer planning—alongside practical guides.

01 / IPv4IPv4 Subnet CalculatorCalculate network and broadcast addresses, masks, usable ranges, and host capacity. 02 / IPv6IPv6 Subnet CalculatorUnderstand prefixes and work through IPv6 network ranges without manual conversion. 03 / DNSBulk DNS LookupResolve DNS records for multiple domains in a single working view. 04 / EmailSPF, DKIM & DMARC CheckerCheck email-authentication DNS records and identify common delivery or spoofing risks. 05 / StorageNAS RAID Capacity CalculatorEstimate usable RAID capacity, parity overhead, failure tolerance, and the displayed TiB value. 06 / BackupBackup Storage CalculatorEstimate destination capacity using retention, change rate, compression, full backups, and reserve. 07 / TransferData Transfer Time CalculatorEstimate copy duration, effective throughput, and whether a backup fits its available window.

Know what the output means.

Tools give you values. These practical guides help you interpret the result and troubleshoot what comes next.