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In addition to management, a bunch of these can serve up files to the WAN side. On Netgear devices it is in a USB storage section.

I do scans from cellular devices (Fing on Android and iOS, is passable for popular ports) and my laptop (nmap) when out and about.

http://portscan.me/ will execute an nmap scan on the request address and print it back. Even works fine with curl.

There's one at http://viewdns.info/ if you're only after common ports.