Network & Domains Calculators
Thirteen server-backed network utilities. Check if a domain looks free, read RDAP, resolve DNS, inspect TLS certificates, probe HTTP headers and status, and parse meta tags or robots.txt. Lookups are rate-limited and block private targets.
Available calculators in Network & Domains (13)
Domain Availability Checker
Check if a domain looks free via public RDAP.
Whois / RDAP Lookup
Registrar, status, dates, and nameservers from RDAP.
DNS Lookup
Resolve A, AAAA, MX, NS, TXT, CNAME, SOA, and CAA.
SSL Certificate Checker
Inspect HTTPS certificate expiry, issuer, and SANs.
IP Lookup
Forward/reverse DNS plus approximate geolocation.
HTTP Headers Checker
Redirect chain and response headers.
Website Status Checker
HTTP status and TTFB sample for a URL.
Domain Age Checker
Age from the RDAP registration date.
Meta & Open Graph Inspector
Title, description, canonical, and og:* tags.
robots.txt & Sitemap Viewer
Read robots.txt and sample linked sitemaps.
Link Extractor
List internal and external links from a page.
Page Speed Lite
DNS and HTML download timings (not Lighthouse).
Favicon & OG Image Preview
Preview favicons and the Open Graph image.
Frequently Asked Questions — Network & Domains
Do you store the domains I look up?
Lookups are processed to answer your request. There is no public history of queries on the site.
Is “available” a guarantee I can buy the name?
No. RDAP 404 is a strong signal, but confirm on a registrar — premium and reserved names can still fail.