NCBI has a online tool named "ORF finder" :http://www.ncbi.nlm.nih.gov/gorf/gorf.html

and can predict the open reading frame, when you know the ORF, you can know the non coded region.

some commercial software also have the function of ORF prediction, like CLC and so on.

If you have the genbank file or accession number, you can simply use coderet from EMBOSS online and all the magic is done automatically:

http://bips.u-strasbg.fr/EMBOSS/

If you have a linux machine or a mac, you can have EMBOSS installed locally. After you install EMBOSS, simply open a terminal and type

coderet file.gbk

where file.gbk is your GenBank file. Coderet will prompt you to save some files, those are, the fasta files for:

All the coding regions

All the proteins

All the mRNAs

All the non-coding regions

And a log of what coderet just made

Hope it was helpful :)

In the NCBI itself options are available to look for ORF and CDS etc

1) Look right side corner for " Customize view"

2) Click "Customize view"

3) Choose "Gene, RNA, and CDS features only"

4) press " Update view"

I hope it may help you.