Well strictly speaking this isn’t really Irish Genealogy but sometimes it can be useful for Irish Genealogy or just web surfing. We’ve all known the frustration of clicking on a link that seemed promising only to get the “404 Not found” error. Sometimes that is just an error in the URL but sometimes it may point you to a page that was there but has disappeared.
For that there is the Wayback Machine. Just copy the URL that wasn’t found and paste it into the”Take me back” box at http://www.archive.org/web/web.php. With any luck you might find what you were looking for.