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Session Report

Summary:
Test run at: 2019-11-26 22:15:44 GMT
Client Prefix (v4): 138.186.56.x/24
Client AS (v4): 264066
IPv4 Probes: 75
Outbound spoofing summary (from the client to our server)
Source address type IPv4
Private - RFC1918 rewritten
Routable received
Largest spoofable neighbor prefix length /22
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 (138.186.56.x/24) can spoof 1023 neighboring addresses (within your /22 prefix)


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
138.186.56.x/24/31264066natblock
138.186.56.x/24/30264066natblock
138.186.56.x/24/29264066yes
138.186.56.x/24/28264066natblock
138.186.56.x/24/27264066yes
138.186.56.x/24/26264066yes
138.186.56.x/24/25264066natblock
138.186.56.x/24/24264066yes
138.186.57.x/24/23264066yes
138.186.58.x/24/22264066yes
138.186.60.x/24/2128103rewritten
138.186.48.x/24/20263858natblock
138.186.40.x/24/19263852natblock
138.186.24.x/24/18263861rewritten
138.186.120.x/24/17264681natblock
138.186.184.x/24/1661784rewritten
138.187.56.x/24/15UNROUTEDrewritten
138.184.56.x/24/14UNROUTEDrewritten
138.190.56.x/24/133303rewritten
138.178.56.x/24/12721natblock
138.170.56.x/24/11721natblock
138.154.56.x/24/10721rewritten
138.250.56.x/24/9786natblock
138.58.56.x/24/8UNROUTEDnatblock

Meaning of status in Received column:

yesPackets spoofed from adjacent netblock were received (but that netblock is within the source AS)
natblockSpoofed probe packets appear to be blocked by your local NAT or firewall rather than being rewritten with a public source address.
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 Outbound Filtering Depth:

The tracefilter test found your host able to spoof routable, non-adjacent source addresses through the first 10 IP hop(s).
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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