Enter a CIDR block and see network, broadcast, usable range, mask, wildcard, and host count.
Divide a CIDR block into equal subnets. See the breakdown of each resulting subnet.
Convert between CIDR notation and IP address ranges. Bidirectional converter.
Calculate IPv6 subnet details. Enter a CIDR block to see network, range, and address count.
Query A, AAAA, MX, TXT, CNAME, NS, SOA, and PTR records from Cloudflare, Google, and Quad9.
Check if DNS changes have propagated across global resolvers in multiple regions.
Domain and IP registration information. See registrar, creation date, nameservers, and contacts.
Find the hostname associated with an IP address via PTR record lookup.
Validate SPF records for email authentication. Check syntax, DNS lookups, and mechanisms.
Check DMARC policy configuration. Validate tags, policy mode, and reporting addresses.
Check if a host is reachable and measure TCP latency to ports 80 and 443.
Trace the network path to a host. See each hop with IP address and round-trip latency.
Scan 19 common ports (SSH, HTTP, HTTPS, databases, mail) on any host.
Inspect SSL certificates. Check issuer, expiry, SANs, and chain validity for any domain.
Check if a website supports HTTP/2, HTTP/3 (QUIC), and which TLS version it uses.
Check if an IP address is listed on major spam blacklists like Spamhaus and Barracuda.
Look up AS number, organization, country, and routing prefix for any IP or ASN.
Convert between dotted decimal, binary, decimal, and hexadecimal IP representations.
See all HTTP headers your browser sends, including User-Agent, Accept, and cookies.
Parse raw email headers to trace the message path, delays, and authentication results.
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