Port Checker: Free Online Tool and Practical Guide
Check one common TCP service port on a public host. This guide explains how to use the free tool and understand the result.
Explore More
Free DNS Propagation Checker: Compare DNS Answers
Compare DNS answers from your server, Google Public DNS and Cloudflare 1.1.1.1. This guide explains how to use the free tool and understand the result.
Free IP Subnet Calculator: CIDR, Mask, Broadcast and Usable Hosts
Calculate network, mask, broadcast, usable range and host count. This guide explains how to use the free tool and understand the result.
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.
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.
