Modifiable VCNs, subnets, and VLANs now available

You can now update VCN and subnet CIDR block information after creation:

• A VCN now supports up to five /16 CIDR blocks.
• You can add or remove CIDR blocks from a VCN.
• You can expand or shrink the size of CIDR blocks in use by VCNs, subnets, and VLANs.
• There is validation in place to make sure shrinking a CIDR block will not affect an IP address that is in use.

For more information, see the documentation articles on VCNs and Subnets.