This may not be feasible in your situation, but if you migrate from telnet to openssh, you'll get an easily parsable SSH_CLIENT environment variable, and a few other benefits as well. 
$ env | grep SSH
SSH_TTY=/dev/pts/44
SSH_CLIENT=172.19.69.68 1850 22

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In reply to Re: telnet ip address by kschwab
in thread telnet ip address by Jaxnoth

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