To search by image hash, just drop the image on the search form, or find its post in any archive and press "view same". It'll be in the URL of your search, and the hash algorithm is the same for every archive.
Then just check any likely-looking threads, and if that doesn't work, google any likely-looking filenames the image is posted as.
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This is a 4chan archive - all of the content originated from them. If you need IP information for a Poster - you need to contact them. This website shows only archived content.
If a post contains personal/copyrighted/illegal content you can contact me at firstname.lastname@example.org with that post and thread number and it will be removed as soon as possible.