OpenWrt – Rev 1

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#!/bin/sh

awk -f - $* <<EOF
function bitcount(c) {
        c=and(rshift(c, 1),0x55555555)+and(c,0x55555555)
        c=and(rshift(c, 2),0x33333333)+and(c,0x33333333)
        c=and(rshift(c, 4),0x0f0f0f0f)+and(c,0x0f0f0f0f)
        c=and(rshift(c, 8),0x00ff00ff)+and(c,0x00ff00ff)
        c=and(rshift(c,16),0x0000ffff)+and(c,0x0000ffff)
        return c
}

function ip2int(ip) {
        for (ret=0,n=split(ip,a,"\."),x=1;x<=n;x++) ret=or(lshift(ret,8),a[x])
        return ret
}

function int2ip(ip,ret,x) {
        ret=and(ip,255)
        ip=rshift(ip,8)
        for(;x<3;ret=and(ip,255)"."ret,ip=rshift(ip,8),x++);
        return ret
}

function compl32(v) {
        ret=xor(v, 0xffffffff)
        return ret
}

BEGIN {
        slpos=index(ARGV[1],"/")
        if (slpos == 0) {
                ipaddr=ip2int(ARGV[1])
                dotpos=index(ARGV[2],".")
                if (dotpos == 0)
                        netmask=compl32(2**(32-int(ARGV[2]))-1)
                else
                        netmask=ip2int(ARGV[2])
        } else {
                ipaddr=ip2int(substr(ARGV[1],0,slpos-1))
                netmask=compl32(2**(32-int(substr(ARGV[1],slpos+1)))-1)
                ARGV[4]=ARGV[3]
                ARGV[3]=ARGV[2]
        }

        network=and(ipaddr,netmask)
        broadcast=or(network,compl32(netmask))

        start=or(network,and(ip2int(ARGV[3]),compl32(netmask)))
        limit=network+1
        if (start<limit) start=limit

        end=start+ARGV[4]
        limit=or(network,compl32(netmask))-1
        if (end>limit) end=limit

        print "IP="int2ip(ipaddr)
        print "NETMASK="int2ip(netmask)
        print "BROADCAST="int2ip(broadcast)
        print "NETWORK="int2ip(network)
        print "PREFIX="32-bitcount(compl32(netmask))

        # range calculations:
        # ipcalc <ip> <netmask> <start> <num>

        if (ARGC > 3) {
                print "START="int2ip(start)
                print "END="int2ip(end)
        }
}
EOF