I just saw that after macOS 10.13, Telnet has been removed.
Probably for security reasons.
But I still want to use it for some network debugging, so I wanted it back.
For the installation:
mkdir ~/NetworkUtils
cd ~/NetworkUtils
curl https://ftp.gnu.org/gnu/inetutils/inetutils-1.9.4.tar.xz -O
tar -zxvf inetutils-1.9.4.tar.xz
cd inetutils-1.9.4
./configure --prefix=/usr/local --disable-servers --disable-hostname --disable-ping --disable-ping6 --disable-logger --disable-talk --disable-tftp --disable-whois --disable-ifconfig --disable-traceroute
make -j8
sudo make install
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