Takes a list of VPC names and outputs their ID and CIDR

cidrs.tf

data "aws_vpc" "found" {
  count = "${length(var.vpc_names)}"

  filter {
    name = "tag:Name"
    values = ["${element(var.vpc_names, count.index)}"]
  }
}

output "vpc_id" {
  value = "${formatlist("%21s %s", data.aws_vpc.found.*.id, data.aws_vpc.found.*.cidr_block)}"
}