docs: public static String addressToString(InetAddress addr) {
          if (addr == null) return "";
  
          StringBuilder hostnameAndAddress = new StringBuilder();
          String address = addr.getHostAddress();
          String hostnameOrAddress = ReverseDNSCache.hostnameOrAddress(addr);
          if (!hostnameOrAddress.equals(address)) {
              hostnameAndAddress.append(hostnameOrAddress);
          }
          hostnameAndAddress.append('/').append(address);
          return hostnameAndAddress.toString();
      }