Network utility hub
Free online network tools for checks, subnet planning, and vendor task scripts.
Use focused tools to check public network signals, calculate practical IPv4 ranges, and generate operator-ready Cisco, FortiGate, and Juniper troubleshooting plans before deeper work begins.
Quick diagnosis
Short tools help technical teams validate symptoms before booking a call.
DNS, MX, SPF/DMARC, SSL, header, redirect, CAA, reverse DNS, subnet, port, and command-plan tools reveal intent around outages, email delivery, public exposure, routing, firewall access, and website security.
Next-step path
The result becomes a practical decision point, not a dead end.
If a check shows risk or uncertainty, the next step can move into assessment, remediation, managed support, or a focused engineering review.
DNS tools
DNS Lookup Tool
Check public A, AAAA, MX, NS, and TXT records for a domain from the QuantumCrafters network diagnostics layer.
Open toolEmail network tools
MX Lookup Tool
Inspect mail exchanger records, priority order, and mail routing signals for business email delivery troubleshooting.
Open toolEmail security tools
SPF and DMARC Checker
Check whether a domain publishes SPF and DMARC records before email spoofing, phishing, and deliverability problems become visible.
Open toolCybersecurity tools
SSL Certificate Checker
Inspect a public website certificate, issuer, validity window, expiry risk, and TLS connection details.
Open toolWebsite security tools
HTTP Security Header Checker
Check a public URL for security headers such as HSTS, CSP, X-Frame-Options, Referrer-Policy, and Permissions-Policy.
Open toolNetwork troubleshooting tools
Port Reachability Checker
Test whether one public TCP port is reachable from the QuantumCrafters diagnostic edge for quick firewall and service triage.
Open toolIP and DNS tools
Reverse DNS Lookup Tool
Check public PTR records for an IP address to validate reverse DNS, mail infrastructure identity, and provider ownership clues.
Open toolDNS security tools
CAA Record Checker
Check DNS Certification Authority Authorization records to see which certificate authorities are allowed to issue certificates.
Open toolWebsite security tools
HTTP Redirect Chain Checker
Trace public HTTP and HTTPS redirects to find long chains, protocol downgrades, unexpected hosts, and final landing URLs.
Open toolNetwork planning tools
IPv4 Subnet Calculator
Calculate IPv4 network address, broadcast address, usable host range, wildcard mask, and host capacity from CIDR notation.
Open toolNetwork automation tools
Vendor Task Script Generator
Generate operator-ready command plans for common Cisco, FortiGate, and Juniper troubleshooting tasks such as packet capture, interface evidence, route checks, and VPN evidence.
Open tool