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Between you and me telnet is not dead. Sometimes I use it to probe a port to verify it is working.

You might wanna use netcat for that instead [1]. Or, for example, socat [2]. Netcat has been around for a long, long time now.

[1] nc (1) - arbitrary TCP and UDP connections and listens

[2] socat (1) - Multipurpose relay (SOcket CAT)

That's not really telnet. Yeah, it's using the same client, but the server and underlying protocol are what's relevant here.

The modern replacement for telnet used in the "probe a port" fashion is nc/netcat.