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XUtilHub

Free Network Tools – What Is My IP, DNS, WHOIS, SSL Checker

Check anything about a website or your connection: see your public IP address, look up DNS records, find who registered a domain and when it expires, test an SSL certificate, inspect HTTP headers and redirects, see if a site is down, and calculate IP subnets.

8 tools

What Is My IPNEW

See your public IP address instantly, whether it's IPv4 or IPv6, plus the browser, language, time zone and screen details websites can see.

DNS LookupNEW

Look up the DNS records of any domain: A, AAAA, CNAME, MX, NS, TXT, SOA and CAA, with TTLs. Reverse DNS for IP addresses. Free and instant.

WHOIS LookupNEW

Find when a domain was registered, how old it is, when it expires, its registrar and name servers. Works for .com, .pk, .in, .co.uk and most other domains.

SSL CheckerNEW

Check any website's SSL certificate: whether it's valid and trusted, when it expires, who issued it, which domains it covers, the TLS version and the full chain.

HTTP Headers CheckerNEW

See the HTTP response headers of any URL, the status code and response time, and grade its security headers: HSTS, CSP, X-Frame-Options and more.

Redirect CheckerNEW

Trace every redirect from a URL to its final page, with status codes (301, 302, 307, 308) and timings. Find redirect chains that hurt SEO and speed.

Is It Down?NEW

Check if a website is down for everyone or just you. See the status code and response time from our server, and what to try if it only fails for you.

Subnet CalculatorNEW

Calculate IPv4 subnets: network and broadcast address, usable host range, subnet and wildcard masks, host count, and split networks into smaller subnets.

Check any website or connection

Whether you run a website, manage a network or just want to know why a page won't load, these tools give you the answer in seconds. They run from our server on the public internet, so you see what the rest of the world sees.

Which tool do I need?

I want to…Use
Find my public IP addressWhat Is My IP
See where a domain points, or check email (MX) and TXT recordsDNS Lookup
Find a domain's age, registrar and expiry dateWHOIS Lookup
Check that HTTPS works and when the certificate expiresSSL Checker
See a site's response and security headersHTTP Headers Checker
Trace where a link redirects toRedirect Checker
Find out if a site is down for everyone or just meIs It Down?
Plan IP ranges and subnetsSubnet Calculator

Moving a website or changing DNS?

After changing your domain's DNS, use the DNS lookup to confirm the new records, the SSL checker to make sure HTTPS works on the new server, and the redirect checker to confirm old URLs go to the right place with permanent (301) redirects.

More tools for websites

Meta tag checker, robots.txt tester, URL parser, user agent parser and HTTP status codes.

Frequently asked questions

Are these network tools free?

Yes. All tools are free with no sign-up. To keep them fast for everyone, each visitor can run about 30 checks of each kind every five minutes.

Do you store the domains I check?

No. Lookups are run on demand and the results aren't saved. Your own IP address isn't stored either.

Where do the results come from?

DNS lookups query public resolvers (Cloudflare, Google and Quad9), WHOIS data comes from each registry's official RDAP or WHOIS service, and SSL and HTTP checks connect to the website directly from our server.

Can I check sites on my local network?

No. For security, our server only connects to public internet addresses, so localhost, 192.168.x.x and other private addresses are refused. The subnet calculator works with any address because it runs in your browser.