Free tools that show what's really going on with your domain, email and website
51 free tools from the team behind TPC Hosting. Score your email setup out of 100, grade your security headers, watch DNS changes spread across 6 public resolvers. Plain-English answers and a fix for every problem.
- Free, no account
- Results in seconds
- Generators run in your browser
- Shareable result links
Find out why your email lands in spam
Check every DNS record inboxes look at before trusting your mail, from MX to BIMI, and get told exactly what to change.
Email Deliverability Checker
One scan, eight checks: MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, BIMI and blocklists. Scored out of 100, with a fix for every gap.
Score your domainBlacklist Check
Is your mail server or domain on a spam blocklist? See where you're listed and how to get removed.
Check blocklistsSPF Record Checker
Validates your SPF record and counts lookups against the hard limit of 10, before one more include breaks it.
Check SPFDKIM Checker
Finds your DKIM keys, measures their strength and flags weak, revoked or test-mode keys.
Check DKIMDMARC Checker
Reads your DMARC policy in plain English and tells you how well it stops people spoofing your domain.
Check DMARCMX Lookup
See which servers receive email for a domain, in priority order, and which provider runs them.
Look up MXEmail Header Analyzer
Paste a message's headers to trace its path hop by hop, spot delays and see which checks failed.
Analyze headersBIMI Checker
Checks your BIMI record, logo and DMARC policy, so your logo can show next to your emails in supporting inboxes.
Check BIMISMTP Test
Connects to your mail servers the way other servers do: greeting, STARTTLS and certificate. No email is ever sent.
Test mail serversSPF Record Generator
Tick the services that send your mail and get a valid SPF record, with its lookup count, ready to paste.
Build SPFDMARC Record Generator
A few choices, one valid DMARC record, plus exactly which host and value to add to your DNS.
Build DMARCWant email that lands in the inbox?
TPC Professional Email comes with antispam and protection against viruses, malware and phishing, plus webmail, calendar and contacts.
Check DNS changes and look up who owns a domain
See your records the way the rest of the internet sees them, follow a change as it spreads, look up who owns a domain and how old it is, and convert international domain names (IDN) to and from Punycode.
DNS Propagation Checker
Just changed a record? Ask 6 public resolvers at once and see side by side who already has the new answer.
Check propagationDNS Checker
Look up any record type straight from public DNS, with the live answer and its TTL.
Look up DNSDig Online
Ask Cloudflare, Google, Quad9 or your own nameserver, and get dig's full answer: flags, every section and the raw output.
Run digDNS Trace
Follow a lookup from the root servers down to the domain's own nameservers, step by step, like dig +trace.
Trace a domainDNSSEC Checker
Checks whether a domain is signed, and whether a broken DS record is making it unreachable.
Check DNSSECWHOIS Lookup
Who a domain is registered with, when it was registered, when it expires and its nameservers, from the registry.
Look up WHOISDomain Age Checker
Reads the registration date from the registry and tells you exactly how old a domain is.
Check domain ageDomain Name Generator
Turn up to three keywords into about 60 domain ideas, then check which ones are free in one click.
Find a namePunycode Converter
Convert international domain names to and from xn-- Punycode, one per line, and spot look-alike characters.
ConvertFound the right name?
Register it with TPC Hosting: full DNS control and free WHOIS privacy for the life of your domain.
Find the security gaps in your website
Grade your security headers, check whether a site is down, follow every redirect, find out who hosts a site and generate the config files your server needs.
Security Headers Checker
Grades a site's HTTP security headers from A+ to F, with ready-to-paste fixes for Apache and nginx.
Grade a siteWebsite Down Checker
Is a site down for everyone or just you? See the status code, how fast it answered and why it fails.
Check a siteWho Is Hosting This Website?
Finds the company behind a website's server, and tells you honestly when a CDN is hiding the real host.
Find the hostRedirect Checker
Follows a URL hop by hop to its final page: status codes, timing, loops and long chains.
Trace redirectsHTTP Header Checker
Every response header a site sends, after its redirects, with the common ones explained in plain English.
See headersHTTP/3 Test
Does a site offer HTTP/3 and HTTP/2? We read what it advertises and send a QUIC probe, so you see what browsers can use.
Test HTTP/3TTFB Test
How fast does a server start answering? We time DNS, connect, TLS and the first byte, three times over.
Test TTFBHtaccess Generator
Build an .htaccess file for HTTPS, www, redirects, security headers, caching and blocked IPs, ready to upload.
Build .htaccessHtpasswd Generator
Turns a username and password into a bcrypt or APR1-MD5 .htpasswd line, entirely in your browser.
Generate a linePassword Generator
Strong random passwords from your browser's cryptographic randomness. Nothing is ever sent to us.
Generate a passwordWant a website that's fast and safe by default?
TPC web hosting runs on NVMe servers, with free SSL, daily backups and malware scanning switched on from day one.
Check what search engines and AI crawlers see
Test which pages your robots.txt blocks for Google and AI crawlers, check your sitemap the way Google reads it, and write robots.txt and llms.txt files.
Robots.txt Tester
Is a URL blocked for Googlebot, Bingbot or AI crawlers like GPTBot? See the rule and line that decides.
Test robots.txtSitemap Validator
Check an XML sitemap the way Google reads it: errors with line numbers, bad dates, duplicates and a spot check of live pages.
Validate sitemapRobots.txt Generator
A valid robots.txt with allow and block rules, a sitemap line and a switch for each major AI crawler.
Build robots.txtllms.txt Generator
Write an llms.txt file that points AI assistants at your most useful pages, in the format from llmstxt.org.
Build llms.txtWant a website that's fast and safe by default?
TPC web hosting runs on NVMe servers, with free SSL, daily backups and malware scanning switched on from day one.
Check, decode and create SSL certificates
Test the certificate a site serves, read what is inside a certificate or CSR, and create a new CSR and private key without them leaving your browser.
SSL Checker
Checks a site's certificate, chain, expiry date and TLS versions, and explains what's wrong in plain English.
Check a certificateSSL Certificate Decoder
Paste a PEM certificate or chain and see its domains, dates, issuer, key and fingerprints, decoded in your browser.
Decode certificateCSR Decoder
Check a certificate signing request before you send it: domains, company details, key size and a signature check.
Decode CSRCSR Generator
Create a CSR and private key for your SSL certificate in your browser. The key never leaves your computer.
Generate CSREvery site deserves a padlock
Certificates from the biggest certificate authorities. Domain-validated ones are issued in minutes.
Check your connection and look up any IP
See your IP and IPv6, look up who runs any IP address or network, check reverse DNS, latency and open ports, and work out subnets.
Ping Test
Times 10 requests from your browser to Cloudflare and Google: latency, jitter and packet loss, explained.
Test my connectionTraceroute
See every router between our server and any website or IP, with host names, networks and timings for each hop.
Trace a routeWhat Is My IP
Your public IP address as websites see it, with its approximate location and provider.
Show my IPIPv6 Test
Find out if your connection has IPv6, see both your IPv4 and IPv6 addresses, and which one your browser prefers.
Test my IPv6IP Lookup
Who runs an IP address or hostname, where it roughly is, its reverse DNS and registration record, looked up in your browser.
Look up an IPReverse DNS Lookup
Find the PTR name of up to 20 IP addresses, or of a hostname, and check it points back to the same IP.
Check reverse DNSASN Lookup
Look up an AS number, an IP address or a network name: the holder, announced prefixes, neighbours and registration record.
Look up an ASNOpen Port Checker
Checks whether a port on your own connection is open, closed or filtered, as seen from the internet.
Check a portSubnet Calculator
Network, broadcast, host range and masks for any IPv4 or IPv6 prefix, worked out in your browser.
CalculateReady for your own server?
TPC VPS hosting gives you full root access, NVMe storage and a dedicated IPv4 address on every plan.
Work out the settings your server needs
Write cron schedules, set file permissions, see what an uptime promise really allows and estimate the bandwidth your site needs.
Cron Expression Generator
Build crontab schedules from dropdowns, or paste one to read it in plain English with its next runs.
Build a scheduleChmod Calculator
Work out chmod permissions with checkboxes, octal or rwx notation, with safe presets for web files and folders.
CalculateUptime Calculator
Turn an uptime percentage into allowed downtime per day, month and year, or work out the percentage from an outage.
CalculateBandwidth Calculator
How much data your site uses each month, and how long a file takes to transfer at a given speed.
CalculateReady for your own server?
TPC VPS hosting gives you full root access, NVMe storage and a dedicated IPv4 address on every plan.
We built these for ourselves first
- Built by the people who run TPC Hosting's servers
- Every result tells you what it means and what to do next
- Free, no account, and results you can share with one link
- Stuck on a fix? Our AI support answers straight away and engineers follow up