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    <p>You can use the following regular expressions separately or by combining them in a joint OR expression.</p> <pre><code>ValidIpAddressRegex = "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$"; ValidHostnameRegex = "^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])$"; </code></pre> <p><strong>ValidIpAddressRegex</strong> matches valid IP addresses and <strong>ValidHostnameRegex</strong> valid host names. Depending on the language you use \ could have to be escaped with \.</p> <hr> <p><strong>ValidHostnameRegex</strong> is valid as per <a href="http://tools.ietf.org/html/rfc1123" rel="noreferrer">RFC 1123</a>. Originally, <a href="http://tools.ietf.org/html/rfc952" rel="noreferrer">RFC 952</a> specified that hostname segments could not start with a digit.</p> <p><a href="http://en.wikipedia.org/wiki/Hostname" rel="noreferrer">http://en.wikipedia.org/wiki/Hostname</a></p> <blockquote> <p>The original specification of hostnames in <a href="http://tools.ietf.org/html/rfc952" rel="noreferrer">RFC 952</a>, mandated that labels could not start with a digit or with a hyphen, and must not end with a hyphen. However, a subsequent specification (<a href="http://tools.ietf.org/html/rfc1123" rel="noreferrer">RFC 1123</a>) permitted hostname labels to start with digits.</p> </blockquote> <pre><code>Valid952HostnameRegex = "^(([a-zA-Z]|[a-zA-Z][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])$"; </code></pre>
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    1. COYour hostname regex is pretty good and looks like it matches everything. You should change your answer so it doesn't have the double escaping for periods and hyphens, and the sz which makes it look like some Microsoft language.
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    2. COHere: http://stackoverflow.com/questions/4645126/looking-for-regex-for-hostname-validation - I explain that names that start with a digit are considered as valid as well. Also, only one dot is questionable issue. Would be great to have more feedback on that.
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    3. COYou might want to add IPv6. The OP didn't specify *what type* of address. (By the way, it can be found [here](http://stackoverflow.com/questions/53497/regular-expression-that-matches-valid-ipv6-addresses/53499#53499))
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