Not a slack (500 points)

All you need to do is to join and read the welcome message.

go.ctf.site 16667

From our scanning results we can see that there is an IRC service running on port 16667. We can use the irssi command or hexchat to connect to the server.

16667/tcp open  irc
16697/tcp open  ssl/irc UnrealIRCd
| irc-info: 
|   users: 43
|   servers: 2
|   ops: 7
|   chans: 26
|   lusers: 36
|   lservers: 1
|_  server: go.ctf.site
| ssl-cert: Subject: commonName=go.ctf.site/organizationName=EKO{th3_f1rst_irc_fl4g}/stateOrProvinceName=Antioquia/countryName=CO
| Not valid before: 2023-10-22T03:44:22
|_Not valid after:  2033-10-19T03:44:22

After connecting to the server, we can get an output of being connected to the IRC server.

FLAG: EKO{message_of_the_day}