assertTrue(newIPv4.isIPv4());
        assertFalse(newIPv4.isIPv6());
        assertEquals(WitnessNotification.WitnessIPAddress.IPV4, newIPv4.getFlags());

        // Check IPv6 address
        WitnessNotification.WitnessIPAddress newIPv6 = newAddresses.get(1);
        assertEquals(ipv6, newIPv6.getAddress());
        assertFalse(newIPv6.isIPv4());
        assertTrue(newIPv6.isIPv6());

            return flags;
        }

        /**
         * Checks if this is an IPv4 address.
         *
         * @return true if IPv4
         */
        public boolean isIPv4() {
            return (flags & IPV4) != 0;
        }

        /**
         * Checks if this is an IPv6 address.
         *
         * @return true if IPv6
         */