Free CIDR Calculator: Convert Prefix Length to Subnet Mask
Convert CIDR prefix to subnet mask, wildcard mask and address capacity. This guide explains how to use the free tool and understand the result.
Explore More
IP Range Calculator: Free Online Tool and Practical Guide
Calculate the number of IPv4 addresses between two addresses. This guide explains how to use the free tool and understand the result.
Free Data Breach & Password Leak Checker: What the Result Means
Check breach exposure for an email when HIBP access is configured and safely check passwords against Pwned Passwords. This guide explains how to use the free tool and understand the result.
Free IT AMC Calculator UAE: Estimate Monthly IT Support Scope
Estimate monthly IT AMC scope and pricing based on users, devices, branches, visits and equipment. This guide explains how to use the free tool and understand the result.
Free SSL Checker: Certificate, Hostname and Expiry Guide
Inspect an HTTPS certificate, issuer, validity period, hostname match and days remaining. This guide explains how to use the free tool and understand the result.
Free Website Uptime Monitor: Track Availability and Response Time
Monitor website availability and response time and receive notifications when a configured monitor changes state. This guide explains how to use the free tool and understand the result.
Free Hardware EOL Checker: Find End-of-Sale and End-of-Support Dates
Search lifecycle records for hardware end-of-sale and end-of-support dates. This guide explains how to use the free tool and understand the result.
Free DNS & Email Checker: Test MX, SPF, DKIM and DMARC
Inspect DNS and business-email configuration including MX, SPF, DMARC and DKIM. This guide explains how to use the free tool and understand the result.
Free IP Lookup: Check ASN, RDAP, Reverse DNS and IP Location
Inspect a public IP address with reverse DNS, ASN/network registration and approximate geolocation details. This guide explains how to use the free tool and understand the result.
IP & Network Tools: Free Online Tool and Practical Guide
Run quick DNS and safe public-network connectivity checks from one page. This guide explains how to use the free tool and understand the result.
