Tools · 31 tools
Domain, DNS and website tools
Every check here runs live, against public resolvers, registries and the site itself. Nothing you look up is stored.
DNS & Network
Records, resolvers, addresses and networks
DNS Lookup
Every record type for a name, with TTLs
DNS Propagation
What resolvers around the world answer right now
DNSSEC Checker
Is the zone signed, and does the chain validate?
IP Lookup
Network, owner, ASN and reverse name for an address
ASN Lookup
Who runs an autonomous system and what it announces
Reverse DNS
The PTR name behind an address, forward-confirmed
Website & HTTP
What a URL answers and what it is built with
SSL & Security
Certificates, headers and blocklists
SSL Checker
Certificate, issuer, expiry and chain for a host
TLS Checker
Protocol versions and cipher suites a server accepts
Security Headers
HSTS, CSP, frame and content-type protections, graded
Blacklist Checker
Is this IP or domain on a DNS blocklist?
Email Security
SPF, DKIM, DMARC and the rest of mail authentication
Domain Discovery
Subdomains, look-alikes and where a domain lives
Subdomain Finder
Subdomains from certificate logs and common names
Reverse IP
Other domains hosted on the same address
Infrastructure Map
Web, mail and DNS hosts, their networks and providers, drawn
Typosquatting Scanner
Look-alike domains that are registered
SEO
Meta tags, robots, sitemaps and indexability
Meta Tag Checker
Title, description, Open Graph and Twitter cards, checked
Robots.txt Checker
Read robots.txt and test a URL against it
Sitemap Checker
Validate an XML sitemap and sample its URLs
Canonical Checker
Does the canonical point where it should?
Indexability Checker
Can a search engine index this URL?
Domain Intelligence
Reports, scores and comparisons