I'm looking for a good tool (web site or not) that I can use to do a simple check whether my web server is accessible from outside LAN (it's serving in a non-standard port).

To give some context, I've gone through this problem: can't access my ip from outside. Even the tools I've found are not really working.

Currently to fetch the html I serve with the online bash tool I do:

curl <my ip>:<my port> \
| sed 's/&/\&amp;/g; s/</\&lt;/g; s/>/\&gt;/g; s/"/\&quot;/g; s/'"'"'/\&#39;/g'

I'm looking for a simple tool that can display the html properly, or just show raw text without resorting to sed html escaping and curl.