Tools from the day job
Real lookups, real math. These are the checks I run on client tenants every week, made public.
// email security check
Will your email land, or get spoofed?
Type any domain. I query its real DNS for SPF, DKIM, DMARC and MX, walk the SPF includes, grade it, and tell you what I'd fix.
try:
–
// dns propagation
Did my DNS change land yet?
Ask three of the world's big public resolvers the same question at once. Turn on watch mode after a change and it re-checks every 30 seconds until they all agree.
// security headers
How locked down is a website?
Follow a site's redirect chain and grade the response headers that stop clickjacking, downgrade attacks, content sniffing and cookie theft, with the fix for each.
try:
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// subnet calculator
See the bits move
Type an address, then drag the prefix. Network bits light up gold, host bits cyan, and the address space splits live.
split into
// your connection
How this page reached you
Measured live from your browser: the Cloudflare data center that answered, your network, the protocol, and real round trips.
- Youyour device
- Your network–
- Cloudflare edge–
- Worker + assetsdaltonsweet-com
--ms round trip