Check DNS, look up domains, test your email, find out who hosts a site, secure a new server and create strong passwords. Instant, private and no sign-up.
Check where a domain points, who it is registered with and when it expires.
Check A, AAAA, CNAME, MX, TXT, NS, SOA and CAA records across seven public DNS resolvers at the same moment. See at a glance whether a change has spread, which resolvers still return old data and how fast each one answers.
Look up any domain’s registrar, creation and expiry dates, status codes and nameservers straight from the registry. Handy for checking when a domain expires, whether it is locked for transfer, or if a name is free to register.
Register 500+ extensions or transfer in with a free 1-year extension. Free DNS management and WHOIS privacy are included.
Make sure your email lands in the inbox and nobody can pretend to be you.
Test your domain’s MX, SPF, DKIM and DMARC records and get a deliverability score from A to F. Every problem is explained in plain English with a ready-to-paste fix, so your mail reaches the inbox and your domain cannot be spoofed.
AstroMail gives your team inboxes on your own domain with full sync, video meetings, antispam and two-factor security.
See what is behind any website, from the server to the network that runs it.
Find out who hosts any website. We trace the domain to its IP address, network (ASN), hosting company and country, spot CDNs and platforms such as Cloudflare or Shopify, and show the nameservers and email provider. You can also look up any IPv4 or IPv6 address.
NVMe storage, LiteSpeed servers, free SSL and a CDN, with 24/7 expert support and free migration from your current host.
Size the right server, then set up and secure it in minutes, not hours.
Choose your options and get a ready-to-run bash script for a new VPS. It creates a sudo user, installs your SSH key, hardens SSH, enables the UFW or firewalld firewall, fail2ban, automatic security updates, swap and more. Copy it or download setup.sh, with a step-by-step view that explains every command.
Not sure how big a server you need? Pick your workload (WordPress, WooCommerce, a web app, Docker, a database, a game server, mail, VPN or Git), set your traffic or users, and get a realistic estimate of the CPU, RAM, storage and bandwidth required, with a matching AstroPod plan and price.
AstroPod Cloud VPS gives you AMD EPYC cores, NVMe storage, 10 Gbps networking and full root access, with your choice of OS and one-click apps.
Small habits that keep your accounts and your website safe.
Create strong random passwords, memorable passphrases and PINs with a cryptographic random generator. See the entropy and the estimated time to crack, and make up to 20 at once. Everything happens in your browser and nothing is stored.
AstroWP includes free SSL and Imunify360 malware protection. Need full control? Cloud VPS gives you root access on AMD EPYC.
AstronautCloud offers seven free online tools for website owners: a DNS propagation checker, a WHOIS lookup, an SPF, DKIM and DMARC email checker, a who-hosts-this-website finder, a VPS size calculator, a server setup script generator for new VPS servers and a strong password generator. They are free, need no sign-up and run in your browser.
| I want to… | Use this tool |
|---|---|
| Check whether a DNS change has propagated | DNS Checker |
| See who registered a domain, and when it expires | WHOIS Lookup |
| Stop my email landing in spam or being spoofed | Email Checker |
| Find out which company hosts a website, or look up an IP | Who Hosts This Website? |
| Work out how much RAM and CPU a VPS needs | VPS Size Calculator |
| Secure a brand-new Ubuntu, Debian or AlmaLinux VPS | Server Setup Script Generator |
| Create a strong password, passphrase or PIN | Password Generator |
Lookups go straight from your device to public DNS and registry servers. Nothing passes through ours.
No accounts, no tracking and no stored results. Recent searches stay on your device, and only if you allow it.
Every result is a fresh query, with a link you can share so a colleague sees exactly what you saw.
Yes. Every tool is free to use, with no account, no sign-up and no usage limits. We build them to help website owners, and we hope you will consider AstronautCloud for your domains, hosting, VPS and email when you need them.
No. The tools run in your browser. DNS and registry lookups go straight from your device to public DNS and registry servers, and passwords and scripts are generated locally. We do not receive or store your lookups. Recent searches and option settings stay on your device, and only if you allow Functional cookies.
Use the DNS Checker. It queries seven public resolvers at once and shows whether they all return the new record.
The WHOIS Lookup shows the registrar, the creation date and the expiry date with a days-left badge, plus the domain’s status codes and nameservers.
Run the Email Checker. It tests your MX, SPF, DKIM and DMARC records, gives a deliverability score from A to F and shows the exact record to add for anything missing.
Use Who Hosts This Website. It traces the domain to its IP address and network and names the hosting company, CDN or platform, and shows the nameservers and email provider.
We build the tools our customers ask for. Send your idea to our team and we will take a look.
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