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Free Network & Security Tools
Look up DNS, WHOIS, SSL, IP addresses, subnets, hashes, and common network diagnostics.
Network problems are easier to diagnose when you can see the records and addresses involved. This category covers DNS, WHOIS, SSL, IP, subnet, hash, and diagnostic lookups. Some tools send a query to a public resolver or API; the page notes when a result depends on a server rather than your browser.
IPv4 to IPv6 Converter
Convert IPv4 addresses to IPv4-mapped IPv6 notation and back.
Open toolMAC Address Formatter
Convert MAC addresses between colon, hyphen, dot, and plain formats.
Open toolTLS Version Checker
Check which TLS protocol versions a server supports.
Open toolWhat Is My IP?
See your public IP address, approximate location, ISP, and browser details.
Open toolWHOIS Domain Lookup
Look up domain registration, expiry dates, registrar, status, and nameservers.
Open toolMAC Address Lookup
Find the manufacturer behind any MAC address or OUI prefix.
Open toolInternet Speed Test
Measure your download speed, upload speed, and latency.
Open toolDNS Record Lookup
Look up A, AAAA, MX, TXT, CNAME, and NS records for any domain.
Open toolSSL Certificate Checker
Check a website SSL certificate, issuer, validity dates, and days until expiry.
Open toolSubnet Calculator
Calculate network address, broadcast, usable hosts, and CIDR ranges.
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