public java.lang.String getCidrBlock() {
        java.lang.Object ref = cidrBlock_;
        if (!(ref instanceof java.lang.String)) {
          com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
          java.lang.String s = bs.toStringUtf8();
          cidrBlock_ = s;
          return s;
        } else {
          return (java.lang.String) ref;
        }
      }
<pre>
Optional. cidr_block must be specified in CIDR notation when using
master_authorized_networks_config. Currently, the user could still use
the deprecated man_block field, so this field is currently optional, but
will be required in the future.
</pre>

<code>string cidr_block = 2 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The cidrBlock.
java-telcoautomation/proto-google-cloud-telcoautomation-v1/src/main/java/com/google/cloud/telcoautomation/v1/MasterAuthorizedNetworksConfig.java