DNS Lookup Tool - allanwallace.uk

DNS Lookup Tool

Enter a domain name into the search box above to retrieve DNS records.

• AUTODISCOVER
   _autodiscover._tcp SRV records
   Versions of Microsoft Outlook use these to locate the relevant Exchange server.

• ADSP
   _adsp TXT records
   Author Domain Signing Practices (Deprecated) were used to handle DKIM signed email for a domain.
   I set to "dkim=discardable" which really meant "dkim=required".

• CAA
   Certificate Authority Authorisation
   This record of type TXT authorises a Certificate Authority to generate certificate for a domain.

• DMARC
   _dmarc TXT records are policies to indicate how to handle email that fails DKIM & SPF checks
   RFC7489 has more info if you like reading RFCs.

• MX
   Mail eXchange records indicate where to deliver email to
   (If a domain has no MX email delivery should be attempted to the A record)

• NS
   NameServer records are how to find the server(s) that gives you all the other records listed here
   (they should all give out the same DNS records too...)

• SOA
   Start Of Authority records prove the DNS is valid, in theory...
   (Without this, the DNS records have no Authority)

• TXT
   TXT records including SPF, SenderID*, DMARC reports acceptance (for unrelated domains), etc.
   * SenderID is NOT recommended by NIST Special Publication 800-177 - Trustworthy Email revision 1, feb 2019.

• SRV
   Service records. this type of DNS record can be used for things like AUTODISCOVER records

ChangeLog

Other tools on this site

Third party domain tools:

Google DNS
IntoDNS
Nominet WhoIs (.uk)
ICANN Lookup (.com)

Third party SPF tools:

Kitterman's SPF Query tool (By the author of RFC 7208)

Further Reading:
RFC 7372,RFC 8553,RFC 8616.

Third party DNSSEC tools:

DANETools DANE validator
NIST DANE-TEST
Verisign Labs DNSSEC Analyzer

IP Address Tools:

ARIN WHOIS (for IP Addresses).
Watchguard Reputation Authority (Site unreachable 20210302@19:48 GMT)

Third party SSL test tools:

Immuniweb Free SSL Scan
Qualys SSL Labs

Last Updated 2022/04/12 18:19 CET.

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