Free network diagnostic tools, no signup, no catch. The same ones we use in our own NOC.
See your public IP address, reverse DNS, network and browser details.
Query A, AAAA, MX, NS, TXT, CNAME and SOA records for any domain.
Registrar, creation and expiry dates, nameservers and status for any domain.
Find the hostname behind an IP address, and check it resolves back.
Test an IP against major DNS blacklists used by mail providers.
Issuer, validity dates, days remaining and the full chain.
Response headers, redirects and security headers for any URL.
MX, SPF, DMARC and DKIM records — why your mail lands in spam.
Test whether a TCP port is reachable and what banner it returns.
CIDR to netmask, usable hosts, network and broadcast addresses.
CIDR reference table, private ranges, reserved blocks and subnet sizes.
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