allanwallace.uk : Tools
DNS Lookup Tool
Enter FQDN, IPv4, [IPv6] or URL to Lookup:


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 - with some exceptions

• NS
   NameServer records are how to find the server(s) that gives you all the other records listed here

• SOA
   Start Of Authority records prove the DNS is valid, in theory...

• TXT
   TXT records including SPF, SenderID*, DMARC reports acceptance for a different domain, 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

Kitterman's SPF Query tool

Third party DNSSEC tools:
DANETools DANE validator
NIST DANE-TEST
Verisign Labs DNSSEC Analyzer


IP Address Tools:
Watchguard Reputation Authority

Third party SSL test tools:
Immuniweb Free SSL Scan
Qualys SSL Labs

Last Updated 2019/06/26 01:50 CET.

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