Look up A, AAAA, CNAME, MX, NS, SOA, TXT or SRV records.
A full DNS report for a domain in one pass.
See how A or NS records resolve on DNS servers worldwide.
Walk the DNSSEC chain of trust from the root down.
Registrar, key dates, nameservers and status codes.
Registration and expiry dates, with time remaining.
Certificate chain, issuer, validity and days to expiry.
Resolve a domain name to its IPv4 addresses.
Response headers for a URL and every redirect hop.
Status codes and redirect paths for www and non-www.
Send requests with custom methods, headers and bodies.
Catch and inspect webhooks and HTTP requests.
Send 4 ICMP echo requests and see loss and latency.
Map up to 10 hops to a host and see where it slows.
Your public IP with its location, ISP and timezone.
Network range, organization and registry for an IP.
See whether an IPv4 address is on DNS blocklists.
Find the hostname behind an IP from its PTR record.
IP to decimal, hex or binary, or IPv4 to mapped IPv6.
Range, netmask and address count for an IPv4 CIDR.
Identify the manufacturer behind a MAC address.
IP or ASN to network name, country and announced prefixes
Test if a TCP port is open on a public host.
A-F grade for DNS, email auth and HTTPS setup with fixes
See which certificate authorities may issue for a domain.
Certificates logged for a domain: issuers, SANs, valid vs expired