Paste a CIDR, a bare IP, an IP range, or a host count — get the answer plus an interactive block map.
Divide a CIDR block into equal subnets. See the breakdown of each resulting subnet.
Convert between CIDR notation and IP address ranges. Bidirectional converter.
Enter an IPv6 CIDR — or a bare address — to see the network, range, and how many /64s fit inside.
Query A, AAAA, MX, TXT, CNAME, NS, SOA, and PTR records from Cloudflare, Google, and Quad9.
Check if DNS changes have reached the major public resolvers — Cloudflare, Google, Quad9, and more.
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 your mail server's name or IP against 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.
Inspect the HTTP request headers our server receives, or fetch any URL's response headers and security-header checklist.
Paste raw email headers to see if a message is legit or spoofed — analyzed in your browser.
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