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Session Report

Summary:
Test run at: 2021-02-10 13:49:08 GMT
Client Prefix (v4): 165.225.220.x/24
Client AS (v4): 22616 (ZSCALER-SJC1)
IPv4 Probes: 66
Outbound spoofing summary (from the client to our server)
Source address type IPv4
Private - RFC1918 unknown
Routable unknown
Largest spoofable neighbor prefix length none
Spoof status key
receivedSpoofed packet was received.Pattern of tests from this IP block indicates a switch from allowing spoofing to blocking it.
rewrittenSpoofed packet was received, but the source address was changed en route.
blockedSpoofed packet was not received, but unspoofed packet was.
unknownNeither spoofed nor unspoofed packet was received.

Warnings:

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. If non-spoofed packets weren't received at a destination, the traceroute to that destination is not included in this graph and may even cause a totally empty graph.

  

  

IPv4 Adjacent Netblock Testing:

Your host (165.225.220.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
165.225.220.x/24/3122616natblock
165.225.220.x/24/3022616natblock
165.225.220.x/24/2922616natblock
165.225.220.x/24/2822616natblock
165.225.220.x/24/2722616natblock
165.225.220.x/24/2622616natblock
165.225.220.x/24/2522616natblock
165.225.220.x/24/2422616natblock
165.225.221.x/24/2322616natblock
165.225.222.x/24/2222616natblock
165.225.216.x/24/2122616natblock
165.225.212.x/24/2022616natblock
165.225.204.x/24/195511natblock
165.225.252.x/24/1822616natblock
165.225.156.x/24/17UNROUTEDnatblock
165.225.92.x/24/1662044natblock
165.224.220.x/24/15UNROUTEDnatblock
165.227.220.x/24/1414061natblock
165.229.220.x/24/1323980natblock
165.233.220.x/24/127020natblock
165.241.220.x/24/114713natblock
165.193.220.x/24/103561natblock
165.161.220.x/24/9UNROUTEDnatblock
165.97.220.x/24/814890natblock

Meaning of status in Received column:

natblockSpoofed probe packets appear to be blocked by your local NAT or firewall rather than being rewritten with a public source address.

IPv4 Outbound 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.
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