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# CIDR Block

<table><thead><tr><th data-type="content-ref">Operation</th><th>Description</th></tr></thead><tbody><tr><td><a href="/api-reference/bmc/cidr-block/describeavailableipv4resources.md">DescribeAvailableIpv4Resources</a></td><td>Queries available IPv4 CIDR blocks</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/inquirypricecreateipv4block.md">InquiryPriceCreateIpv4Block</a></td><td>Queries the price of creating IPv4 CIDR blocks</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/createipv4block.md">CreateIpv4Block</a></td><td>Creates IPv4 CIDR blocks</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/describeavailableipv6resources.md">DescribeAvailableIpv6Resources</a></td><td>Queries available IPv6 CIDR blocks</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/createipv6block.md">CreateIpv6Block</a></td><td>Creates IPv6 CIDR blocks</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/describecidrblocks.md">DescribeCidrBlocks</a></td><td>Queries list of CIDR blocks</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/modifycidrblocksattribute.md">ModifyCidrBlocksAttribute</a></td><td>Modifies the information about CIDR blocks, such as the names</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/renewcidrblock.md">RenewCidrBlock</a></td><td>Renews a CIDR block</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/terminatecidrblock.md">TerminateCidrBlock</a></td><td>Returns a CIDR block</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/releasecidrblocks.md">ReleaseCidrBlocks</a></td><td>Releases one or more CIDR blocks</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/describeinstanceavailablecidrblock.md">DescribeInstanceAvailableCidrBlock</a></td><td>Queries available CIDR blocks for the instance</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/describecidrblockips.md">DescribeCidrBlockIps</a></td><td>Queries list of CIDR block IPs</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/bindcidrblockips.md">BindCidrBlockIps</a></td><td>Assigns CIDR block IPs to instances</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/unbindcidrblockips.md">UnbindCidrBlockIps</a></td><td>Unassigns CIDR block IPs from instances</td></tr><tr><td><a href="/api-reference/bmc/cidr-block/createbyoip.md">CreateByoip</a></td><td>Create a BYO IP</td></tr></tbody></table>