Developer11 min
DNS Debugging with dig: TTL, Propagation, and Record Types
Use dig to diagnose DNS problems, including TTL and record types.
DevOps Tools
DNS, SSL, cron, and Docker helpers for shipping and debugging infrastructure — 12 free tools, no signup required.
DevOps Tools focus on infrastructure checks and config helpers: DNS lookups, SSL certificate inspection, cron expressions, and Docker Compose scaffolding. They shorten the feedback loop when you are shipping a service and need to confirm DNS propagation or certificate expiry without SSHing into a box first.
All DevOps Tools
Who these tools are for
- SREs validating DNS and TLS after a deploy
- Platform engineers drafting Compose files for local stacks
- Developers scheduling jobs with cron expressions they can verify
How to choose
- Use DNS Checker after changing A/AAAA/CNAME records
- Use SSL Checker before a launch to catch chain or expiry issues
- Build Compose locally, then adapt for production orchestrators
FAQ
Are DNS and SSL checks server-side?
Yes. These tools must query the network from our servers. We rate-limit requests and do not sell query data.
Can I check internal hostnames?
Public DNS/SSL tools only see the public internet. Internal hostnames require your VPN or private tooling.
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