dig
DNS & email diagnostics, run against every major resolver at once
live queries, run at request time
MrPotatoe.com
>
Run lookup
ALL
COMMON
A
AAAA
CNAME
MX
TXT
NS
SOA
SRV
CAA
Lookup
Propagation
Email health
Reverse DNS
WHOIS
SSL / TLS
DNSSEC
Port check
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Table
Raw dig
Name
Type
TTL
Value
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Table
Raw dig
Propagation uses whichever record type is selected above (defaults to A when "all common" is selected).
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Checks
Raw dig
>
Run reverse lookup
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Table
Raw dig
Query
Result
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Table
Raw RDAP
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Table
Raw CT log entry
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Checks
Raw dig
>
TLS handshake
Check port
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Only ever tests your own current public IP — it can't be pointed at anyone else's address.