Classless Inter-Domain Routing

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CIDR

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.

CIDR Netmask

Calculates CIDR ranges (e.g. 10.0.0.0/24).

IP Address

Free CIDR For Your Web Site

To place the search box on your web site, Copy the following HTML code and place it in your web page.

1 Enter CIDR range or IP

2 Press the button “CIDR”

 <table width="243" border="0" cellspacing="0" cellpadding="0" align="center"><tr><td><a href="http://www.ipaddressguide.com"><img src="http://www.ipaddressguide.com/images/cidrnetmask.gif" width="243" height="23"border="0" alt="IPAddressGuide.com"></a></td></tr><tr><td><table width="243" height="85" border="0" cellspacing="0" cellpadding="0"><tr><td background="http://www.ipaddressguide.com/images/ipaddressguidebg.gif" align="center"><table width="96%" border="0" cellspacing="0" cellpadding="0"><tr><td colspan="2" height="6"></td></tr><tr><td align="center"><a href="http://www.ipaddressguide.com"><img src="http://www.ipaddressguide.com/images/ipaddressguide.gif" alt="IPAddressGuide.com" width="120" height="12"border="0"></a></td></tr><tr><td colspan="2" height="8"></td></tr><tr><td align="center"><table width="100%" border="0" cellspacing="0" cellpadding="0"><tr><td width="41%"><form name="form1" method="post" action="http://www.ipaddressguide.com/cidr.aspx?"style="WIDTH:100%"><table width="100%" border="0" cellspacing="0" cellpadding="0"><tr><td width="79%" align="center"><INPUT id="txtCIDR" name="txtCIDR" style=" FONT-SIZE:10px; WIDTH:75px; COLOR:#000000; FONT-FAMILY:Arial, Helvetica, sans-serif; TEXT-ALIGN:center"></td></tr><tr><td width="21%" align="center"><input id="btnCIDR" type="submit" value="CIDR" name="btnCIDR" style="FONT-SIZE: 10px; COLOR: #000000; FONT-FAMILY: Arial, Helvetica, sans-serif"></td></tr></table></form></td><td width="59%" align="right" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"><tr><td width="9%" style="FONT-SIZE: 10px; COLOR: #616161;FONT-FAMILY: Arial, Helvetica, sans-serif;">1</td><td width="91%" style="FONT-SIZE: 10px; COLOR: #616161;FONT-FAMILY: Arial, Helvetica, sans-serif;">Enter CIDR range or IP</td></tr><tr><td valign="baseline" style="FONT-SIZE: 10px; COLOR: #616161;FONT-FAMILY: Arial, Helvetica, sans-serif;">2</td><td style="FONT-SIZE: 10px; COLOR: #616161;FONT-FAMILY: Arial, Helvetica, sans-serif;">Press the button “CIDR”</td></tr></table></td></tr></table></td></tr></table></td></tr></table></td></tr></table>