Subnet Mask Regular Expression

A regular expression to match a Subnet Mask, which is a logical subdivision of an IP network.

/^(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])(?:\.(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])){3}$/

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IP Address (V4) Examples:

• 255.255.255.0
• 255.224.0.0

See Also:

• URL (With And Without Port Number) Regular Expressions
• IP Address (V6) With Port Regular Expression
• IP Address (V4) With Port Regular Expression