Not working in FF (Desktop stable, win)
I do wonder if there's a typo in the URL that OP intended, because the title is "https://16777217/" whereas the URL is "https://16777217." and . and / are only a key away from each other (at least on my IE/UK ISO layout).
Edit: leaving the above despite being untrue save semantically. inet_atom just wants byte order addresses dot separated and adding a trailing dot isn't anticipated and returning a error.