I use "nmap" for this. $ nmap example.com PORT STATE SERVICE 80/tcp open http 44... | Hacker News

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		schipplock on June 24, 2021 \| parent \| context \| favorite \| on: Hacker deleted all of NewsBlur’s Mongo data and is... I use "nmap" for this. `$ nmap example.com PORT STATE SERVICE 80/tcp open http 443/tcp open https 1119/tcp closed bnetgame 1935/tcp closed rtmp`

exciteabletom on June 24, 2021 [–]

A more complete answer using nmap and cron:

    MAILTO="youremail@yourdomain.com"
    */30 * * * * nmap yourdomain.com | grep open > nmap.log.tmp; diff nmap.log nmap.log.tmp; mv nmap.log.tmp nmap.log

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