These tools run without an account and without storing what you looked up. They query the same DNS resolvers and the same community reputation data that power the ReportedIP API, so an answer here is the answer our customers get.
None of these block anything and none of them need an account. Three tell you what is already public about a domain or an address, one shows what your own visit gives away, and the last collects attack data and hands it back to the network.
DNS Diagnostics · Free
Domain health diagnostics from 76 resolvers across 6 continents. Validate SPF, DKIM, DMARC and DNSSEC, run DNSBL lookups and track propagation during migrations.
PTR Check · Free
Resolve the PTR record of an IPv4 or IPv6 address and check whether it resolves back. A PTR record nobody confirms is the most common reason a mail server is refused at the door.
Reputation Lookup, Free
Look up an address or domain across curated blacklists at once and see which one lists it, so you know where to ask for removal.
SPF, DKIM, DMARC, Free
Validate the four records that decide whether your mail is trusted, and get told which one is missing, too permissive or contradicting another.
Privacy Mirror, Free
Everything a website learns the moment you arrive: address, location, network, browser fingerprint. Shown back to you and stored nowhere.
HTTP Hardening · Free
Read the security headers a site actually sends, weighted by what each one prevents. Tells you the directive to change, not just the header that is missing.
RDAP · Free
Find the mailbox responsible for an address and get a report draft. Reporting to the widest allocation is the same as not reporting at all.
Crawler Check · Free
Your log says Googlebot. Find out whether it really was, using the check the search engines themselves publish.
Network Reputation · Free
See the network behind an address: who runs it, how much of it we know, and how it ranks against every other network in the community data.
Standalone PHP App · Free
A fake site that exists only to record who attacks it, dressed up as WordPress, Drupal or Joomla. 36 threat analyzers score every request and feed clean intel back.