Wi-Fi Channel Guide: Free Online Tool and Practical Guide
Reference recommended non-overlapping Wi-Fi channels and planning notes. This guide explains how to use the free tool and understand the result.
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DHCP Pool Calculator: Free Online Tool and Practical Guide
Calculate a DHCP allocation range within an IPv4 subnet. This guide explains how to use the free tool and understand the result.
VLAN / Network Planner: Free Online Tool and Practical Guide
Create a simple private-IP VLAN plan from device counts. This guide explains how to use the free tool and understand the result.
Download Time Calculator: Free Online Tool and Practical Guide
Estimate transfer time from file size and connection speed. This guide explains how to use the free tool and understand the result.
Bandwidth Calculator: Free Online Tool and Practical Guide
Convert Mbps/Gbps to MB/s and estimate usable throughput. This guide explains how to use the free tool and understand the result.
MAC Address Generator: Free Online Tool and Practical Guide
Generate locally administered unicast MAC addresses for labs and testing. This guide explains how to use the free tool and understand the result.
MAC Address Vendor Lookup: Free Online Tool and Practical Guide
Identify the manufacturer/OUI for a MAC address using the free MACVendors lookup service. This guide explains how to use the free tool and understand…
Server Reachability / Ping Tool: Free Online Tool and Practical Guide
Measure safe TCP reachability latency to HTTPS/HTTP on a public host. This guide explains how to use the free tool and understand the result.
Reverse DNS Checker: Free Online Tool and Practical Guide
Find PTR/reverse-DNS hostname for a public IP. This guide explains how to use the free tool and understand the result.
IP Blacklist Checker: Free Online Tool and Practical Guide
Run an indicative check against several public DNS-based blocklists. This guide explains how to use the free tool and understand the result.
DKIM Checker: Free Online Tool and Practical Guide
Look up a DKIM TXT record using a supplied selector. This guide explains how to use the free tool and understand the result.
DMARC Checker: Free Online Tool and Practical Guide
Inspect DMARC policy, reporting and enforcement level. This guide explains how to use the free tool and understand the result.
SPF Checker: Free Online Tool and Practical Guide
Find SPF records and flag common configuration problems. This guide explains how to use the free tool and understand the result.
