Ip Blocking from domain

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This topic contains 1 reply, has 2 voices, and was last updated by  Vadim Smirnov 3 years, 4 months ago.

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  • #5397

    vampie
    Participant

    Is there any way to get hostname/domain from tcp header using your library

    I need only google.com ( not IP ) by listening packets..
    or Should I need to sniff 53 port for DNS UDP’s

    what if dns cached by os or browser?

    I need real time host getting..

    #7155

    Vadim Smirnov
    Moderator

    You can query all IP addresses corresponding google.com:

    Addresses: 2a00:1450:4002:800::1003
    188.43.67.102
    188.43.67.106
    188.43.67.108
    188.43.67.109
    188.43.67.113
    188.43.67.117
    188.43.67.121
    188.43.67.123
    188.43.67.79
    188.43.67.83
    188.43.67.87
    188.43.67.91
    188.43.67.93
    188.43.67.94
    188.43.67.98
    and monitor packets to/from these IP’s. If you suspect that IP of google.com may change you can also monitor DNS queries and update the domain IP list accordingly.

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