What this site offers
NexKit Network Tools provides an automatic domain, IP, ASN and CIDR diagnostic SuperTool, plus 43 focused tools covering IP lookups, DNS, email authentication (SPF, DKIM, DMARC, BIMI, MTA-STS, TLS-RPT), RDAP / WHOIS, SSL certificates, HTTP response headers, subnet calculations and a handful of everyday encoding utilities. No sign-up or account is required to use any tool.
How results are produced
Not every tool works the same way. Before you rely on a result, it helps to know which category it falls into:
- On-device tools (the subnet and CIDR calculators, IPv4 and IPv6 converters, MAC formatter, URL parser, UUID generator, SHA hash generator, Base64 encoder/decoder, Unix timestamp converter, and the HTTP status and port references) run entirely in your browser and never transmit the value you type in.
- Lookup tools (DNS, DNSSEC, the email-authentication checkers, reverse DNS, RDAP / WHOIS, the SSL certificate checker, public IP, the IPv6 connectivity test, and the HTTP header checker) send the domain, IP address, hostname or URL you enter to the public resolver, registry or service that produces the result. See Privacy for the full list of services involved.
Every tool panel also shows a “How this result is produced” note describing that specific tool’s method and limitations.
Website & DNS Monitoring
/monitoring is a separate, opt-in feature. It lets you save up to five website or DNS targets, identified by a randomly generated key stored in your browser, and optionally receive email alerts when a target’s status changes. Unlike the on-device tools above, saved monitoring targets and their check history are stored on NexKit’s servers.
Contact
Questions, feedback or privacy inquiries about NexKit Network Tools are welcome on the Contact page.