WHOIS Domain Lookup – Online Simple Registration Check
Enter a domain and see public WHOIS info via a free API with rate limiting. Quick domain check.
UD5 Toolkit
Paste any text containing links and instantly extract all URLs along with their domain names.
http://, https:// or www.. It then parses each link to extract the domain (e.g. example.com). You can choose to remove duplicates and view results in a table or as a list of unique domains.
https://example.com/page and shortened ones that begin with www. (e.g., www.example.com). The tool automatically prepends https:// for www‑style links. Bare domain names (e.g., example.com) without http:// or www. are intentionally skipped to avoid false matches.
http://, https:// and www. prefixes. If a link is written as a bare domain (like “example.com”) without a prefix, it won’t be captured. Also check for extra spaces or odd punctuation breaking the URL. If necessary, manually add https:// before extraction.
Enter a domain and see public WHOIS info via a free API with rate limiting. Quick domain check.
Interactive cheatsheet for JavaScript regular expressions with live examples. Click any token to see its explanation and test it on sample text immediately.
Enter keywords and get domain name ideas by mixing, prefixing, suffixing, and replacing. Check availability indication.
Search a complete list of all top‑level domains. See which still have availability. For brand naming. Static reference.
Enter a simple regular expression and see its equivalent Deterministic Finite Automaton diagram. Learn how regex engines work.
Test a regular expression against malicious inputs to detect catastrophic backtracking and ReDoS vulnerabilities. Educational.
Practice positive/negative lookahead and lookbehind. See matches highlighted live. Master advanced regex.
Check WHOIS information for any domain: registrar, expiration date, and name servers. Quick and private using public WHOIS data aggregators.
Query DNS records for any domain directly from your browser using DNS-over-HTTPS. See A, AAAA, MX, CNAME, and TXT. No logs.
Test regular expressions with Unicode property escapes like \p{Emoji}. See matches live. Modern regex power.
Test a regex against long strings and measure execution time. Detect catastrophic backtracking patterns. Visual warning if slow.
An interactive reference for regular expression tokens. Click a token to see its explanation and example. Learn regex faster.
Paste a regular expression and get a step‑by‑step plain English explanation of what it does. Learn regex.
Enter a regular expression and see a visual railroad diagram explaining the pattern. Learn and debug regex.
Check WHOIS information for any domain: registrar, expiration date, and name servers. Quick and private using public WHOIS data aggregators.
Query DNS records for any domain directly from your browser using DNS-over-HTTPS. See A, AAAA, MX, CNAME, and TXT records. No logs.
Extract all email addresses from a text block using a regex pattern. Deduplicate and sort results. Handy for lead extraction. Data stays on your machine.
Perform simple or regex-based find and replace operations on text. Batch replace words, phrases, or patterns instantly. Processed locally in your browser.
Build and test regular expressions against sample text. Real-time match highlighting, capture groups display, and flavor options. All inside your browser.