These tools run without an account. 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. Generators build their records in your browser.
Check the records that decide whether your mail is trusted, write the ones that are missing, and find out whether the sending server is on a blacklist.
Mail Authentication · Free
Check the seven records that decide whether your mail is trusted and delivered encrypted, and get told which one is missing, too permissive or contradicting another.
SPF Record · Free
Build the SPF record from the services that send your mail, with the real number of DNS lookups for every include. Loads what you publish today and merges it.
DMARC Record · Free
Write a DMARC record that follows RFC 9989, with a dated plan from p=none to p=reject and the extra record an external report mailbox needs.
DKIM Key · Free
Create an RSA or Ed25519 key pair in the browser and get the DNS record in the format your DNS panel accepts. Checks the key once it is published.
MTA-STS Policy · Free
Read your mail servers from MX and get the MTA-STS policy file, the _mta-sts record and the TLS-RPT record in one pass.
BIMI Record · Free
Write the default._bimi record for your brand logo and see first whether your DMARC policy lets any mailbox show it.
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.
Follow a DNS change around the world, resolve an address back to its name, and find the network and the abuse mailbox behind it.
DNS Diagnostics · Free
Domain health diagnostics from about 100 resolvers in more than 50 countries. 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.
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.
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.
Harden the headers a site sends, tell a real crawler from a fake one, and see what your own visit gives away.
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.
Crawler Check · Free
Your log says Googlebot. Find out whether it really was, using the check the search engines themselves publish.
Privacy Mirror · Free
Everything a website learns the moment you arrive: address, location, network, browser fingerprint. Shown back to you and stored nowhere.
Software for your own server that collects attack data and hands it back to the network.
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.
Mail is rejected or lands in spam. Start with the Email Security Check. It reads seven records and links each finding to the generator that fixes it: SPF, DMARC, DKIM, MTA-STS and TLS-RPT and BIMI. If the server itself is refused, look up the sending address in the blacklist check and its reverse DNS.
A DNS change does not show up everywhere. The DNS Checker asks about 100 resolvers in more than 50 countries and shows which regions still see the old value.
An address keeps showing up in your logs. Abuse Contact finds the mailbox to report it to, the ASN Report shows the network behind it, and Bot Verification tells a real crawler from a fake one.
A website needs hardening. Security Headers weighs every header by what it prevents and names the directive to change.
You want to see your own visit from the other side. What We Know About You shows what a website learns the moment you arrive.
How each check works, and what our measurements behind the tools show, is in 15 free tools for DNS, email and IP checks. Inputs, the daily limit and what is stored are in the free tools overview.