About NosHost
NosHost is a set of free tools for people who look after websites: checking DNS records, email authentication, SSL certificates, redirects and server settings, and generating the config to fix what they find.
What the tools do
There are 32 tools today, in 7 groups. Some run on our server, because they need to make live network requests: looking up DNS records, connecting to a site to read its certificate, following redirects. Others run entirely in your browser, such as the generators and the Email Header Analyzer, so what you type into them never reaches us.
Every result tries to answer three questions: what we found, whether it is a problem, and what to do about it. Where a fix involves config, we give you lines you can copy.
How checks work
- Server-side checks run when you submit a request. Results can be cached for up to ten minutes, depending on the tool. Results show the original measurement time and identify reused data.
- Checks come from one server. Sites that answer differently by country may look different from where you are.
- Checks connect to public addresses. HTTP tools use approved web ports; SSL checks support their listed TLS ports. The Open Port Checker tests selected TCP ports only on the visitor's own public address. The checker page explains these requests.
- To keep the service available for everyone, there is a limit on how many checks one connection can run per minute and per hour.
- The combined report reserves six checks for a website report or four for email DNS. Checks run sequentially with a 90-second budget; one failed item can be retried within that budget. Report data expires from the short-term cache after ten minutes.
What NosHost is not
We do not sell hosting, domains or email services, and the tools do not recommend providers. The results are a starting point for troubleshooting, not a security audit or a guarantee.
Contact
Found a wrong result, an outdated explanation or a bug? Email [email protected]. Including the tool name and what you entered helps us reproduce it.