Unsure what version of a IWAD you have? You can check online here. If you have the MD5 or SHA-1 hash of the IWAD you can enter it below, if you can't get the hash or are unsure then you can use the uploader instead.
A full list of IWAD hashes can be found on the Hash List page
If you would like a WAD hosted then you can use the form below to upload a WAD/PK3. If you point your WAD Url or website field on your Doom server to http://www.theultimatedoom.com then Doomseeker will automatically download it.