Blog & Tool Guides
How-tos and guides for using our DevOps tools.
- How to Check SSL Certificate Expiry
Use our free SSL checker to verify certificate validity, expiry, and chain. No login required.
- How to Scan a Website for Malware
Check your site for malware and security issues with our online scanner. Quick, free, and private.
- Cron Expressions Explained
Understand cron syntax and translate expressions to human-readable schedules. Handy for DevOps and scheduling.
- How to Check DNS Propagation
Learn what DNS propagation is, why it takes time, and how to check whether your DNS changes have propagated across global resolvers.
- How to Reduce Docker Image Size
Practical ways to slim Docker images — smaller base images, multi-stage builds, fewer layers — and how to measure image size before and after.
- How to Check for Open Ports on a Server
Understand open, closed, and filtered ports, why exposed ports are a security risk, and how to scan a host for open ports online.