Network tools
Diagnose domains and servers: look up DNS records, query WHOIS/RDAP registration data and domain age, verify SSL certificates, inspect HTTP headers and redirect chains, check your public IP, and calculate subnets and IP address formats. Network checks only reach public addresses.
HTTP Headers CheckerSee a URL’s response headers, redirect chain and security-header score.
DNS LookupLook up A, AAAA, CNAME, MX, TXT, NS, SOA and CAA records for any domain.
WHOIS LookupDomain registration details via RDAP: registrar, creation and expiry dates, name servers.
SSL Certificate CheckerCheck a site’s SSL/TLS certificate: validity, expiry date, issuer and chain.
Subnet CalculatorIPv4 and IPv6 CIDR calculator: network, broadcast, mask, host range and subnets.
IP Address ConverterConvert IPs to decimal, hex, binary; expand or compress IPv6 addresses.
What Is My IPSee your public IP address, browser, operating system and screen details.