roman (@hi@romanzolotarev.com)

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#!/bin/sh
jot 254 1 |
  xargs -n1 -P256 sh -c '
    ping -c 1 192.168.1.$1 >/dev/null 2>/dev/null &&
      echo $1
    ' sh

a bit faster

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@hi @libreleah Or this: nmap 192.168.1.0/24

As usual, the man page knows all kinds of options, in particular for different scan types.

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nmap is not in the base :)

Runs faster if you ping in parallel:

Requires bash, but could be easily converted to ksh/oksh/mksh/pdksh