Free IP, DNS, domain and email tools
Run practical network checks directly in your browser. No server-side port scanner, shell command or arbitrary URL fetch is used by these tools.
IP and connectivity
IP lookup
Check ASN, organization, approximate location and reverse DNS.
IP geolocation
Estimate city, region, country and network from a public IP.
IPv4 / IPv6 test
Check whether your current connection can reach both protocol families.
IP converter
Convert IPv4/IPv6 into binary, hexadecimal, expanded and reverse-DNS forms.
DNS, domains and email
DNS lookup
Query A, AAAA, MX, NS, TXT, CNAME and CAA records.
DNS diagnostic
Review common DNS records, SPF, DMARC, CAA and DNSSEC signals.
Email diagnostic
Inspect MX, SPF, DKIM, DMARC, Autodiscover, MTA-STS, TLS-RPT and BIMI.
Email deliverability
Interpret email DNS configuration and get prioritized recommendations.
Domain lookup
Read public registration data via RDAP.
Subnet and address calculators
IPv4 subnet calculator
Network, mask, wildcard, broadcast, range and host counts.
IPv6 calculator
Calculate prefix ranges and subnet counts.