CIDR is the short for Classless Inter-Domain Routing, an IP addressing scheme that replaces the older system based on classes A, B, and C. A single IP address can be used to designate many unique IP addresses with CIDR. A CIDR IP address looks like a normal IP address except that it ends with a slash followed by a number, called the IP network prefix. CIDR addresses reduce the size of routing tables and make more IP addresses available within organizations.

You may use the below IP to netmask calculator to easily translate a CIDR address into netmask format.

CIDR to Netmask

Netmask to CIDR


Add The Netmask Widget On Your Website

You can easily add the netmask widget on your website by copying the following HTML code and place it on your web page

Netmask to IP Address Range Utility Tool | IPAddressGuide
Netmask to IPv4 Conversion



Widget
<div style="text-align:center">
	<form action="https://www.ipaddressguide.com/netmask" method="post">
		<p style="background:#fff;border:1px solid #99A8AE;width:180px;padding:5px 5px 5px 5px;font-size:11px;font-family:'Trebuchet MS',Arial,Sans-serif;">
			<a href="https://www.ipaddressguide.com" target="_blank"><img src="https://www.ipaddressguide.com/images/ipaddressguide.png" alt="Netmask to IP Address Range Utility Tool | IPAddressGuide" border="0" width="120" height="12" /></a><br />
			<b>Netmask to IPv4 Conversion</b><br /><br />
			<label>CIDR</label><br />
			<input type="text" name="cidr" value="" style="border:solid 1px #C0C0C0;font-size:9px;width:110px;" /><br />
			<input type="submit" value="Calculate" style="width:100px;font-size:10px;margin-top:3px;padding:2px 3px;color:#FFF;background:#8EB50C;border-width:1px;border-style:solid;">
		</p>
	</form>
</div>

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