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Session Report

Summary:
Test run at: 2021-03-09 20:46:05 GMT
Client Prefix (v4): 81.187.27.x/24
Client AS (v4): 20712 (AS20712)
IPv4 Probes: 69
Outbound spoofing summary (from the client to our server)
Source address type IPv4
Private - RFC1918 blocked
Routable blocked
Largest spoofable neighbor prefix length /27
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.
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 (81.187.27.x/24) can spoof 31 neighboring addresses (within your /27 prefix)


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
81.187.27.x/24/3120712yes
81.187.27.x/24/3020712yes
81.187.27.x/24/2920712yes
81.187.27.x/24/2820712yes
81.187.27.x/24/2720712yes
81.187.27.x/24/2620712rewritten
81.187.27.x/24/2520712no
81.187.27.x/24/2420712no
81.187.26.x/24/2320712no
81.187.25.x/24/2220712no
81.187.31.x/24/2120712no
81.187.19.x/24/2020712no
81.187.11.x/24/1920712no
81.187.59.x/24/1820712no
81.187.91.x/24/1720712no
81.187.155.x/24/1620712no
81.186.27.x/24/158248no
81.185.27.x/24/1412626no
81.191.27.x/24/132116no
81.179.27.x/24/129105no
81.171.27.x/24/1160781no
81.155.27.x/24/102856no
81.251.27.x/24/93215no
81.59.27.x/24/813127no

Meaning of status in Received column:

noPackets spoofed from adjacent netblock were not received, probably due to blocking
yesPackets spoofed from adjacent netblock were received (but that netblock is within the source AS)
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 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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