用 “ipconfig“ 可以看到自己的 IP地址 后面加个 "/all " 就可以看到详细信息
比如说网关，网卡，DNS，等信息

arp -a ： 查看与你能够通信的局域网主机IP地址 

net view 可以看到局域网内的所有的机器

------解决方案--------------------
test.bat

BatchFile code
@echo off
set IPPart1=192
set IPPart2=168
set IPPart3=10
set IPPart4=#
goto :next
for /l %%a in (2,1,254) do (
  ping -n 1 -l %IPPart1%.%IPPart2%.%IPPart1%.%%a >nul
)
rem Don't care whether an IP is pingable. We just need the arp cache.
:next
arp -a>"%temp%\UsedIP.tmp"

for /l %%a in (254,-1,2) do (
  findstr "%IPPart1%\.%IPPart2%\.%IPPart1%\.%%a" "%temp%\UsedIP.tmp"||set IPPart4=%%a
  goto :FindIP
)

:FindIP
if "%IPPart4%" neq "#" (
  echo Find an available IP: %IPPart1%.%IPPart2%.%IPPart1%.%IPPart4%
) else (
  echo No IP is available currently.
)
pause
goto :eof