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Center for Applied Internet Data Analysis
Session Report

Test run at: 2017-09-07 16:18:22 GMT
Client Prefix (v4): 83.208.252.x/24
Client AS (v4): 5610 (O2-CZECH-REPUBLIC)
IPv4 Probes: 117

Egress spoofing summary
Address type IPv4
Private rewritten
Routable rewritten
Largest spoofable neighbor prefix none

Warnings:

  • Your host is behind a Network Address Translation (NAT) router or firewall which rewrites the source addresses of the test traffic. To test your provider's network further, you must remove the NAT/firewall/router and connect directly.

    IPv4 AS Route:

    This test run probed the following paths in order to infer your ability to send different spoofed source packets. Each node in the graph corresponds to an autonomous system, i.e. different Internet service providers. NOTE: This graph does NOT show if an AS blocks spoofed packets, only the path taken by received spoofed packets. The IP Path Details are available for this run.
    
    

    IPv4 Adjacent Netblock Testing:

    Your host (83.208.252.x/24) can spoof 0 neighboring addresses


    Spoofed IP (anon)Prefix
    Length
    ASN of
    Spoofed IP
    Received
    83.208.252.x/24/315610rewritten
    83.208.252.x/24/305610rewritten
    83.208.252.x/24/295610rewritten
    83.208.252.x/24/285610rewritten
    83.208.252.x/24/275610rewritten
    83.208.252.x/24/265610rewritten
    83.208.252.x/24/255610rewritten
    83.208.252.x/24/245610rewritten
    83.208.253.x/24/235610rewritten
    83.208.254.x/24/225610rewritten
    83.208.248.x/24/215610rewritten
    83.208.244.x/24/205610rewritten
    83.208.236.x/24/195610rewritten
    83.208.220.x/24/185610rewritten
    83.208.188.x/24/175610rewritten
    83.208.124.x/24/165610rewritten
    83.209.252.x/24/1544581rewritten
    83.210.252.x/24/14UNROUTEDrewritten
    83.212.252.x/24/135408rewritten
    83.216.252.x/24/1212355rewritten
    83.192.252.x/24/113215rewritten
    83.240.252.x/24/1015525rewritten
    83.144.252.x/24/933965rewritten
    83.80.252.x/24/89143rewritten

    Meaning of status in Received column:

    rewrittenThe source address of the probe packets we received differs from the spoofed address. It appears that an intermediate device is rewriting your packet headers.

    IPv4 Egress Filtering Depth:

    The tracefilter test found your host unable to spoof routable, non-adjacent source addresses through even the first IP hop.
    Summary:
    The results from all tests are aggregated to produce a summary "State of IP Spoofing" report.
    Feedback:
    We welcome questions and feedback to the Spoofer Information Mailing List and invite users to join the Spoofer Users Mailing List for discussion and announcements.
      Last Modified: