Do I need to worry about these logs?

[Gerard Samuel]

This is a fresh install of 5.3 from last week.
Granted the script-kiddies has been working to break in via ssh,
when I was running 4.10, I've never seen these types of logs before.
Any clues, would be appreciated.
Thanks.

-- snip of /var/logs/auth.log --
Nov 16 09:06:56 hivemind sshd[7611]: reverse mapping checking 
getaddrinfo for 203-150-17-44.inter.net.th failed - POSSIBLE BREAKIN 
ATTEMPT!