Check network information from your IP address.You can see IPv4/IPv6, ISP information, browser info, and more.
Look up information from an IP address, hostname, or URL.Shows IP version, type, reverse DNS, country/region, ASN, and ISP info.
Fetch DNS records for a domain in one go.Supports A / AAAA / MX / NS / TXT / CNAME / SOA, and accepts URLs and Punycode (IDN) as input.
Forward lookup (domain/hostname → IP address) and reverse lookup (IP address → domain/hostname).Supports IDN TLDs (Punycode) and IPv6, and also performs the reverse conversion on results so you can check both directions at once.
Check whether a specific port is open on an FQDN (domain) or IP address from the Internet.Supports URL input and Punycode (IDN) as well.
Fetch HTTP headers from a URL. Supports following redirects as well.
Follow HTTP redirects and inspect the redirect chain and final destination.
Check whether your current network environment supports IPv6.
Automatically detect your current Internet Service Provider (ISP).
Convert an IPv4 address to a 32-bit number and back.
Calculate subnet information from an IP address and subnet mask.
Look up ASN information from IP addresses.
Check whether an IP address is private, global, or a special-purpose address.
Shorten a long URL into a short link.You can choose a custom ID, and the short link redirects directly without interstitial ads.
Get Whois information for domains and IP addresses.Supports IDN (Punycode) and IPv4/IPv6.
Check a site's SSL/TLS certificate information.
Check whether your current IP is detected as a VPN/proxy.
Check HTTP security headers and see recommended settings.
Fetch a domain's registration date and calculate its age.
Check whether iCloud Private Relay appears to be in use.
Fetch a domain's expiration date and related registration info.