Domain & Server Tools
Bulk Domain Age Checker
Check domain age using the Bulk Domain Age Checker for free, up to 10 domains at once.
14 Free Tools
Domain & Server Tools
Look under the hood of any domain — DNS records, WHOIS data, IP addresses, SSL certificates, HTTP headers and redirects — with fast, safe server-side lookups.
Every domain hides a stack of details: where its DNS points, who registered it, which server answers, and whether its certificate is valid.
These tools surface that information quickly, whether you're diagnosing a connection problem, researching a domain, or checking a migration went through.
Lookups that need the network run through a safe, SSRF-protected server request; the rest work in your browser.
Domain & Server Tools
Bulk Domain Availability Checker
Use this tool to search domain availability in bulk, whether for your personal project, business, or anything else, all for free.
Domain & Server Tools
DNS Lookup
DNS Lookup tool is a tool that searches for all DNS records such as A, AAAA, CNAME, MX, NS, CAA, and TXT records for a particular domain name.
Domain & Server Tools
Domain Age Checker
Domain Age Checker is the simplest tool to find the age of a domain by fetching the data directly from the WHOIS database, free of charge.
Domain & Server Tools
Domain Availability Checker
Use the Domain Availability Checker tool and register the domain that fits your audience and business.
Domain & Server Tools
IP Lookup
Find an IP address and its location with this free IP Lookup tool. Verify an IP address, and its geolocation if you're curious about it.
Domain & Server Tools
WHOIS Lookup
WHOIS Lookup tool is a tool that helps you find out all you need to know about a domain, from creation date to domain's owner, all for free.
Domain & Server Tools
SSL Certificate Checker
Check SSL/TLS certificate details, validity, expiration, security grade, and certificate chain for any domain.
Domain & Server Tools
Subnet Calculator
Free IPv4 subnet calculator. Enter an IP and CIDR prefix or netmask to instantly get network and broadcast addresses, host range, subnet mask, wildcard, and binary.
Domain & Server Tools
User Agent Parser
Free User Agent parser. Paste any User-Agent string to instantly detect the browser, version, rendering engine, operating system, device type, CPU, and bots in your browser.
Domain & Server Tools
HTTP Header Checker
Check any URL's HTTP response headers and status code. See server, caching, security, and content-type headers, plus any redirects. SSRF-safe server-side fetch.
Domain & Server Tools
Redirect Checker
Trace a URL's full redirect chain hop by hop. See each status code (301, 302, 307), the final destination, and any redirect loops. SSRF-safe server-side fetch.
Domain & Server Tools
Domain to IP
Resolve any domain name to its IPv4 (A) and IPv6 (AAAA) addresses. Paste a full URL and we'll use just the domain. Fast, SSRF-safe DNS lookup.
Domain & Server Tools
What Is My IP
Instantly see your public IP address, plus your browser, operating system, screen, language, and the request headers our server received. Nothing is stored.
Investigating a domain
Start with the basics: the WHOIS Lookup shows who registered a domain and when, while the DNS Lookup lists the A, MX, TXT, and other records that route its traffic and mail.
To go from a name to the server behind it, the Domain to IP tool resolves the IPv4 and IPv6 addresses in one step.
Diagnosing a live site
When a page misbehaves, the response tells the story. The HTTP Header Checker reveals status codes, caching, and security headers, and the Redirect Checker traces the full hop-by-hop path a URL follows — catching loops and long chains.
Before launch, confirm the padlock with the SSL Certificate Checker, which reports a certificate's issuer and expiry date.
Planning and research
Registering something new? The domain availability and age checkers — including bulk versions — let you screen many candidates at once.
These lookups query public records and live servers on your behalf, and none of the domains you check are stored.
Good to know
Frequently Asked Questions
Are these domain lookups safe and private?
Yes. Network lookups run through a server request hardened against SSRF, and the domains or URLs you check are not stored as content — only basic rate-limiting counters are kept.
Why does a domain resolve to more than one IP address?
Large sites spread traffic across multiple servers and content delivery networks, so a single domain often has several IPv4 or IPv6 addresses.
Can I check many domains at once?
Yes. The Bulk Domain Availability Checker and Bulk Domain Age Checker accept a list and process every entry in one run.
What do HTTP headers tell me about a site?
They reveal the server software, caching rules, content type, cookies, and security policies — useful for diagnosing why a page is slow, not caching, or being blocked.
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