4 ms·

Is it even possible to scan IPv6 internet? Or simply too many IPs (theoretically) to try?

• chatmasta 10y ago
  Since IPv6 addresses are allocated in large blocks, and organizations tend to assign IP addresses sequentially, you could probably scan a decent portion of the IPv6 space by doing a binary search on the addresses within each block of a certain size to identify the max active address in each block.
• cmdrfred 10y ago
  On its face I believe not but, now I'm not positive on the specifics but I believe there are ip4 to ip6 bridges that index ip6 addresses and allow you to only scan active addresses.
  • dannypgh 10y ago
    No. There are 2^128 or so possible IP addresses. Such an index wouldn't fit anywhere. I think you're thinking of 6to4, which maps a /64 onto every v4 address. But allocation within the /64 may still be super sparse...
• ranger207 10y ago
  Although I think it's practically infeasible to scan the entire IPv6 range, it is possible to see who's on v6 through other methods, like when Shodan added a bunch of its servers to the NTP pool to find v6 users. http://arstechnica.com/security/2016/02/using-ipv6-with-linux-youve-likely-been-visited-by-shodan-and-other-scanners/ http://arstechnica.com/security/2016/02/using-ipv6-with-linu...