Capturing Visited URL Porblem

[neutralfox]

Hello everyone,
Hope everyone fine over here. Well, i am having a small problem , actually, i am developing a software to record all visited url's (from any browser). To do that, i am using SharpPCap, I have managed to capture all packets, but the problems is with the IP, i am having all kind of IP addresses and I want to turn these IP's addresses to their respective domain names.

E.g
Google IP is 64.233.189.147 and I want the program to return www.google.com.

I have tried something but i am only getting some weird output, like
"hkg01s01-in-f104.1e100.net" instead of "www.google.com" . Dudes, I am totally confused, can someone help me please.

The code:
This is where i am using sharppcap

.
                                    .
                                    .
            DateTime time = packet.PcapHeader.Date;
            int len = packet.PcapHeader.PacketLength;
            TCPPacket tcp = (TCPPacket)packet;
            string srcIP = tcp.SourceAddress; 
            string destIP = tcp.DestinationAddress; 
                                    .
                                    .
                                    .

Here, i am trying to resolve the domain name.

.
                                    .
                                    .
try
            {
                IPHostEntry IpToDomainName = Dns.GetHostEntry(destIP);
                Console.WriteLine("DomainName: {0}", IpToDomainName.HostName);
            }
            catch
            {
                Console.WriteLine("err");
            }
                                    .
                                    .
                                    .

Thanks in advance friends.
Regards,
Mike.