Free IP, DNS & Network Tools
Look up DNS records, check your IP, calculate subnets, inspect HTTP headers, and more. No signup, no tracking — most calculations run right in your browser.
Popular tools
See your public IPv4/IPv6 address, network, and connection details.
Open toolLook up any IP: version, type, ASN, network, approximate location, and rDNS.
Open toolQuery A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, SRV and PTR records.
Open toolCompare DNS answers across multiple public resolvers to spot inconsistencies.
Open toolCalculate network, broadcast, masks, ranges and host counts for IPv4/IPv6.
Open toolValidate and classify single or bulk IPv4/IPv6 addresses — no network calls.
Open toolStructured registration data for domains, IPs and ASNs via RDAP.
Open toolCheck MX, SPF, DMARC and DKIM records and get a mail-DNS health summary.
Open toolInspect response status, redirect chain and HTTP headers for any public URL.
Open toolReview CSP, HSTS, and other HTTP security headers for a public URL.
Open toolBrowse by category
IP Tools
Look up, validate, convert, and inspect IP addresses.
DNS Tools
Query DNS records and check propagation across resolvers.
Email DNS Tools
Check MX, SPF, DMARC and DKIM records for a domain.
Network Calculators
Subnet, CIDR, and address conversion — all in your browser.
Website Diagnostics
Inspect HTTP responses, headers, and response time.