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TLS github.com
MAIL github.com
RDAP example.com
PROP cloudflare.com
resolution
dig
every record type, or just one
prop
agreement across the fixed resolver list
ttl
remaining lifetime per record
delegation
ns
root to tld to authoritative walk
dnssec
chain of trust, ds and dnskey
registration
rdap
registration data with status codes decoded
watch
domain and certificate expiry, computed now
transport
tls
chain, validity spans, protocols
http
headers, redirect chain, security headers
trace
dns, tcp, tls and ttfb timing
mail
mail
mx, spf, dkim, dmarc and alignment policy
spf
include tree, against the ten lookup limit
addressing
ip
reverse dns, asn, prefix, neighbours
asn
prefixes and address space
net
address space grid, a /24 or smaller
reachability
ping
icmp echo, round trip time and packet loss
route
the hops between here and there, with reverse dns
ports
which tcp ports are open, closed or filtered
meta
vs
two domains side by side
src
resolver list, cache ceilings, upstream health
help
this list