Free network & website tools
Check any domain, URL or IP in one place: status code, certificate, DNS, WHOIS, open ports and blacklists. Free, no sign-up.
Tools by task
8 toolsIs a website up?3
HTTP Status CheckerStatus code, redirect chain and headers of any URL.2003014045xxSSL Certificate CheckerIs the certificate valid, when it expires, who issued it.expiryissuerSANPort CheckerIs a TCP port open on a server or IP.80443223306Domain & DNS2
DNS LookupWhere a domain points and how its mail is routed.AAAAAMXTXTNSCNAMESOAWhois LookupRegistrar, creation and expiry dates, nameservers.registrarexpiryNSWhat is going wrong?
Pick a symptom to see which tools to useWebsite does not open
- 1Run HTTP Status Checker. A 5xx code or a timeout means the server has a problem. A 200 means the site works from outside.
- 2Check DNS Lookup. No A record or a wrong IP means the domain does not point to the server.
- 3Check port 443 in Port Checker. A closed port means a firewall or a stopped web server.
- 4If it is a known service, open its status page. You will see whether other people report the same problem.
Certificate error
- 1Run SSL Certificate Checker. Look at the expiry date and whether the certificate covers this domain.
- 2Check DNS Lookup. After a move to a new host, the domain may still point to a server with an old or default certificate.
Emails bounce or land in spam
- 1Check the sending IP in IP Blacklist Checker. A listing on Spamhaus or SpamCop is a common reason for rejected mail.
- 2Check the domain in Domain & Email Blacklist Checker. Domain blocklists flag links and sender domains, not IPs.
- 3Check MX and TXT records in DNS Lookup. A missing SPF record often sends mail to the spam folder.
Can't connect to a server
- 1Check the port in Port Checker. For example 25565 for Minecraft or 3306 for MySQL.
- 2Check What Is My IP. Some servers allow only certain IP addresses or countries.
Domain stopped working
- 1Check the expiry date in WHOIS Lookup. An expired domain stops resolving within days.
- 2Check NS records in DNS Lookup. Wrong or missing nameservers make the whole domain unreachable.
Is a popular service down?
Live status from user reports and official status pages
Outages todayHow our tools work
Same rules for all 8 tools
- Free, no sign-up. There is a per-IP rate limit to keep the tools fast.
- We don't save what you check. A result lives only in the link you share.
- Checks run from our servers, not from your browser, so you see what the rest of the internet sees.
- Private addresses are blocked: localhost and internal networks cannot be checked.
Frequently asked questions
Are these tools free?
Yes. All 8 tools are free and work without an account. Each IP address has a rate limit so the tools stay fast for everyone.
Why does a site work for me but fail in the HTTP checker?
Our checks come from servers in data centers. Many sites block that kind of traffic to stop bots, so they answer 403 to us and work normally in your browser. The HTTP Status Checker shows when a site is behind Cloudflare or a similar service.
How do I find out why my emails go to spam?
Check the sending IP in the IP Blacklist Checker and your domain in the Domain & Email Blacklist Checker. Then look at the MX and TXT records in DNS Lookup: a missing or broken SPF record is one of the most common causes.
Can I check a server on my local network?
No. The checks run from our servers on the public internet, so they cannot reach addresses like 192.168.x.x or localhost. For private networks, run the check from a computer inside that network.
Do you store the domains I check?
No. We don't keep a history of checked domains, URLs or IP addresses. The result exists only in your browser and in the link you choose to share.