Free network diagnostic tools for DNS, IP, email and SSL checks
A GNS3-style editor for containers, VMs, switches and routers that runs in your browser
Stage
Not given
Not given
Founded
Not given
2022
Based in
IN
FR
Pricing model
Freemium
Free
Pricing
Free plan: All 41 tools with unlimited checks, 3 saved domains with daily monitoring, 7 days of history. Pro plan: $29/month for 50 domains, scans every 6 hours, email, Slack, Telegram and webhook alerts, 12 months of history and API access.
Not given
Key features
DNS Lookup - resolve A, AAAA, MX, TXT, NS, CNAME records
Blacklist Checker - query 7 major DNS blocklists
SSL/TLS Certificate Checker - verify certificate chain, expiry and protocol support
Email Deliverability - check SPF, DKIM and DMARC records
WHOIS Lookup - query domain registration details
Reverse DNS (PTR) - check IP to hostname resolution
Port Checker - test common HTTP/HTTPS ports
BIMI Lookup - query BIMI TXT records
Domain monitoring with automated scans
Multi-channel alerts via email, Slack, Telegram and webhooks
Visual lab editor with drag-and-drop interface for network devices
Mix containers and VMs in the same lab
Configure switches with VLANs and trunks
Automatic or manual routing between networks
Add network conditions like latency, jitter and packet loss
Export to Docker Compose, Vagrant, Proxmox, Kubernetes and cloud platforms
Import GNS3 projects and convert them to labs
Real-time validation as you design
Desktop app with consoles, VNC screens and packet capture
Works offline and runs entirely in the browser
What makes it different
41 tools all available free with unlimited checks
Clear sourcing - every result shows its source and what was not tested
Live DNS queries from edge servers via DNS-over-HTTPS
Domain monitoring and alerts with affordable Pro plan at $29/month
Runs in your browser with no installation or account required
Exports to multiple environments from one lab design
Private by design with no data leaving your browser
Open isoloom.yml format that you own and can version control
The Network Tools
Isothrum