Session Report
Test run at: 2023-05-26 21:50:07 GMT
Client Prefix (v4): 191.37.136.x/24
Client AS (v4): 263360
IPv4 Probes: 60
Outbound spoofing summary (from the client to our server) Source address type IPv4 Private - RFC1918 ✔ blocked Routable received Largest spoofable neighbor prefix length /8
Spoof status key received Spoofed packet was received. ✔ Pattern of tests from this IP block indicates a switch from allowing spoofing to blocking it. rewritten Spoofed packet was received, but the source address was changed en route. blocked Spoofed packet was not received, but unspoofed packet was. unknown Neither spoofed nor unspoofed packet was received.
Warnings:
- ⚠️ Your host is behind a Network Address Translation (NAT) router or firewall but spoofed packets are still being received without modification. See here for more information.
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 (191.37.136.x/24) can spoof 16777215 neighboring addresses (within your /8 prefix)
Spoofed source address (anon) Prefix
LengthASN of spoofed
source addressReceived 191.37.136.x/24 /31 263360 yes 191.37.136.x/24 /30 263360 yes 191.37.136.x/24 /29 263360 yes 191.37.136.x/24 /28 263360 natblock 191.37.136.x/24 /27 263360 yes 191.37.136.x/24 /26 263360 yes 191.37.136.x/24 /25 263360 yes 191.37.136.x/24 /24 263360 yes 191.37.137.x/24 /23 263360 yes 191.37.138.x/24 /22 263360 yes 191.37.140.x/24 /21 266387 yes 191.37.128.x/24 /20 263359 yes 191.37.152.x/24 /19 263362 yes 191.37.168.x/24 /18 271023 yes 191.37.200.x/24 /17 263371 yes 191.37.8.x/24 /16 263348 yes 191.36.136.x/24 /15 263335 yes 191.39.136.x/24 /14 4230 yes 191.33.136.x/24 /13 18881 yes 191.45.136.x/24 /12 7738 yes 191.53.136.x/24 /11 28202 yes 191.5.136.x/24 /10 263536 yes 191.101.136.x/24 /9 61317 yes 191.165.136.x/24 /8 26615 yes Meaning of status in Received column:
yes Packets spoofed from adjacent netblock were received yes Packets spoofed from adjacent netblock were received (but that netblock is within the source AS) natblock Spoofed 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:
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