Dnsstuff is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best Mac alternative is Website Monitoring by Uptime.com. It's not free, so if you're looking for a free alternative, you could try SPFToolbox or Statusdroid. If that doesn't suit you, our users have ranked more than 25 alternatives to Dnsstuff and three of them are available for Mac so hopefully you can find a suitable replacement.
Uptime.com: Real-time availability monitoring & response for preventing website downtime. Your complete website monitoring solution.
SPFtoolbox is an open-source Javascript and PHP app to look up DNS records such as SPF, MX, Whois, and more
Statusdroid operates a worldwide network of servers which checks your website every 30 seconds from over 15 worldwide locations.
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