This is a valid ipv4 address
The decoded URL for this submission is <a href="http://184.172.10.74/" rel="nofollow">http://184.172.10.74/</a> — the server for Hacker News.<p>Here's some other encodings you can use for the same address, they're all valid and recognised by most browsers and other software:<p><a href="http://3098282570/" rel="nofollow">http://3098282570/</a><p><a href="http://7393249866/" rel="nofollow">http://7393249866/</a><p><a href="http://0xb8.0xac.0x0a.0x4a/" rel="nofollow">http://0xb8.0xac.0x0a.0x4a/</a><p><a href="http://0270.0254.0012.0112/" rel="nofollow">http://0270.0254.0012.0112/</a><p>The source for this comment is an XSS filtering bypass tool by <i>RSnake</i> — <a href="http://ha.ckers.org/xsscalc.html" rel="nofollow">http://ha.ckers.org/xsscalc.html</a>