@echo off

IF "x%MYTESTIP_1%" == "x" (
  echo MYTESTIP_1 is not specified
)
IF "x%MYTESTIP_2%" == "x" (
  echo MYTESTIP_2 is not specified
)
IF "x%MYTESTIP_3%" == "x" (
  echo MYTESTIP_3 is not specified
)
goto :EOF

:test
echo TEST
goto :EOF