public com.google.protobuf.ByteString getMasterIpv4CidrBlockBytes() {
      java.lang.Object ref = masterIpv4CidrBlock_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        masterIpv4CidrBlock_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
Optional. The /28 network that the masters will use. It should be free
within the network.
</pre>

<code>string master_ipv4_cidr_block = 3 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for masterIpv4CidrBlock.
java-telcoautomation/proto-google-cloud-telcoautomation-v1/src/main/java/com/google/cloud/telcoautomation/v1/StandardManagementConfig.java